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The Stack · Directory

The AI tool directory for founders & agents

252 tools across 22 categories — frameworks, LLM & search APIs, voice, memory, browser automation, payments, and more. Each page has pricing, auth, a 1-click signup, code samples, and whether an agent can provision a key on its own (175 can).

🧩 Or build a whole stack in one go — the Agent Stack Explorer →

Start here — the essential stack

One strong pick per job
Orchestrate your agent

LangGraph

★ 39k

Graph-based orchestration for stateful, multi-actor agent workflows with explicit control flow and checkpointing.

Give it web search

Exa

MCP

Neural/semantic web search API purpose-built for AI agents, returning clean results plus full page contents and highlights.

Call any model

OpenRouter

A single OpenAI-compatible API that routes to 300+ LLMs from every major provider, with per-key budgets and programmatic key provisioning.

Add voice

ElevenLabs

MCP

Ultra-realistic text-to-speech, voice cloning, dubbing, and voice-agent APIs for developers and creators.

Give it memory

Mem0

★ 63k

A memory layer for AI agents — extracts, stores, and retrieves user/agent facts across sessions.

Store embeddings

Pinecone

MCP

The managed serverless vector database most RAG teams reach for — autoscales to zero, with a control-plane Admin API for programmatic project and key provisioning.

Let it browse

Browserbase

MCP

Managed fleet of headless cloud browsers with stealth, proxies and live view — the 'AWS for browsers' most agent frameworks run on.

Let it act in apps

Arcade

MCP runtime that handles OAuth and authorized tool-calling so AI agents can act on behalf of a specific user across 7,500+ agent-optimized tools.

Agent frameworks 12

Best agent frameworks →

Libraries for orchestrating LLM agents, tools, and multi-step control flow.

AutoGen

Agent frameworks · Python
★ 60k

Microsoft's framework for multi-agent conversation, with a programming model for agents that talk to each other and tools.

CrewAI

Agent frameworks · Python
★ 57k

Role-playing autonomous agents that collaborate as a 'crew' with defined roles, goals, and task delegation.

LlamaIndex

Agent frameworks · Python
★ 51k

Data framework for connecting LLMs to private data — indexing, retrieval, and agentic RAG over your documents.

Agno

Agent frameworks · Python
★ 42k

Batteries-included agent runtime — built-in memory, knowledge/RAG, and AgentOS, a control plane you run in your own cloud. Formerly Phidata.

LangGraph

Agent frameworks · Python
★ 39k

Graph-based orchestration for stateful, multi-actor agent workflows with explicit control flow and checkpointing.

DSPy

Agent frameworks · Python
★ 37k

Programming — not prompting — language models: compile declarative pipelines into optimized prompts/weights.

OpenAI Agents SDK

Agent frameworks · Python
★ 28k

OpenAI's lightweight agent framework — a small set of primitives (Agents, Handoffs, Guardrails, Sessions); provider-agnostic via LiteLLM. Evolved from Swarm.

Google ADK

Agent frameworks · Python
★ 21k

Google's Agent Development Kit — a code-first, model-agnostic toolkit for building, evaluating, and deploying multi-agent systems. Optimized for Gemini.

Pydantic AI

Agent frameworks · Python
★ 19k

Type-safe agent framework from the Pydantic team — structured outputs, dependency injection, and model-agnostic agents.

Claude Agent SDK

Agent frameworks · Python
★ 7.8k

Anthropic's SDK for building agents on Claude — the harness behind Claude Code, with in-process tools, hooks, and an interactive client. Formerly the Claude Code SDK.

Strands Agents

Agent frameworks · Python
★ 6.8k

AWS's model-driven agent SDK — give it a prompt and tools and let the model plan, call tools, and reflect in a loop. First-class Bedrock, MCP-native, OpenTelemetry tracing.

Cloudflare Agents

Agent frameworks · TypeScript
★ 5.4k

TypeScript-first SDK for stateful agents where each agent is a Durable Object — embedded SQLite, WebSockets, cron scheduling, and hibernation, running globally on Cloudflare's edge.

Agent memory 3

Best agent memory →

Long-term and working memory for agents that persist across runs.

Mem0

Agent memory · Python
★ 63k

A memory layer for AI agents — extracts, stores, and retrieves user/agent facts across sessions.

Letta (MemGPT)

Agent memory · Python
★ 24k

Stateful agents with long-term memory and self-editing context, evolved from the MemGPT research.

Zep

Agent memory · Go
★ 4.8k

Long-term memory store for agents with a temporal knowledge graph of facts and their validity over time.

Vector databases 8

Best vector databases →

Embedding stores powering retrieval for RAG and agent recall.

Milvus

Vector databases · Go
★ 46k

Cloud-native vector database built for billion-scale similarity search.

DuckDB

Vector databases · C++
★ 40k

In-process analytical database whose vss extension adds an HNSW vector index — vector search alongside your columnar analytics.

Qdrant

Vector databases · Rust
★ 34k

High-performance vector search engine with rich filtering, written in Rust for production-scale retrieval.

Chroma

Vector databases · Rust
★ 29k

Open-source embedding database designed for simplicity — the default vector store for many RAG prototypes.

pgvector

Vector databases · C
★ 22k

Vector similarity search inside Postgres — keep embeddings next to your relational data.

Weaviate

Vector databases · Go
★ 17k

Open-source vector database with hybrid search and built-in modules for vectorization and RAG.

LanceDB

Vector databases · Rust
★ 11k

Embedded, in-process vector database on the columnar Lance format — versioned, updatable, larger-than-RAM retrieval with no server.

sqlite-vec

Vector databases · C
★ 8.0k

A single-file SQLite extension for vector search — exact brute-force KNN that lives inside the database you already ship.

MCP & tool servers 2

Best mcp & tool servers →

Model Context Protocol servers and tool-calling infrastructure.

MCP Servers

MCP & tool servers · TypeScript
★ 89k

The reference collection of Model Context Protocol servers — connect agents to files, GitHub, databases, and more.

FastMCP

MCP & tool servers · Python
★ 27k

The fast, Pythonic way to build MCP servers and clients — decorators over boilerplate.

Evals & testing 3

Best evals & testing →

Measuring agent and LLM output quality, regressions, and safety.

promptfoo

Evals & testing · TypeScript
★ 24k

Test-driven prompt and agent development — evals, red-teaming, and side-by-side model comparison from the CLI.

DeepEval

Evals & testing · Python
★ 17k

Pytest-like framework for unit-testing LLM outputs with metrics for hallucination, relevancy, and bias.

Ragas

Evals & testing · Python
★ 15k

Evaluation toolkit for RAG pipelines — faithfulness, answer relevancy, and context metrics without ground truth.

Observability 3

Best observability →

Tracing, logging, and monitoring for LLM and agent systems.

Langfuse

Observability · TypeScript
★ 33k

Open-source LLM engineering platform — tracing, evals, prompt management, and metrics for agent apps.

Phoenix

Observability · Jupyter Notebook
★ 11k

Arize's open-source observability for LLM apps — OpenTelemetry-based tracing and evaluation.

Helicone

Observability · TypeScript
★ 6.0k

Open-source observability for LLM apps via a proxy — logging, caching, and cost tracking with one header.

Agent runtimes 2

Best agent runtimes →

Sandboxes and execution environments for running agent code/tools.

Temporal

Agent runtimes · Go
★ 22k

Durable execution platform — write long-running, failure-resilient agent workflows as ordinary code.

E2B

Agent runtimes · TypeScript
★ 13k

Secure cloud sandboxes for running AI-generated code — the runtime layer for code-executing agents.

Search & retrieval APIs 15

Best search & retrieval apis →

Web search and retrieval APIs built for LLMs and agents — clean results, page contents, RAG.

Brave Search API

Search & retrieval APIs · usage based
🟡 MCP

Independent search-index API (web, news, images) with an LLM-focused Answers/Grounding endpoint, from a privacy-first crawler.

Exa

Search & retrieval APIs · freemium
🔵 MCP

Neural/semantic web search API purpose-built for AI agents, returning clean results plus full page contents and highlights.

Firecrawl

Search & retrieval APIs · freemium
🔵 MCP

Web-data API to search, scrape, crawl and map sites into clean markdown/structured data for LLMs — one call returns full page content.

Google Programmable Search (Custom Search JSON API)

Search & retrieval APIs · freemium
🟡

Google's official JSON API to query a Programmable Search Engine — a cheap, widely-used web/image search baseline for retrieval.

Jina Reader

Search & retrieval APIs · freemium
🔵

URL-to-LLM-markdown reader (r.jina.ai) and web search (s.jina.ai) that work with a simple URL prefix — even without an API key.

Kagi Search API

Search & retrieval APIs · usage based
🟡

Privacy-first, ad-free search API from Kagi with high-quality results, plus a FastGPT/Summarizer endpoint for LLMs.

Linkup

Search & retrieval APIs · freemium
🔵 MCP

Production-grade web search API for AI that returns sourced, cited answers or raw results to reduce hallucination.

Parallel Search API

Search & retrieval APIs · freemium
🔵 MCP

Search API built from the ground up for AI agents — pass an objective and get URLs plus token-relevant compressed excerpts.

Perplexity Sonar API

Search & retrieval APIs · usage based
🟡 MCP

Search-grounded LLM API (Sonar models) that returns cited answers with live web search built in, plus a raw Search API.

SearchApi.io

Search & retrieval APIs · freemium
🔵

Real-time SERP API across 20+ engines (Google, Bing, YouTube, Maps, Scholar) with a pay-for-success model and structured JSON.

SerpApi

Search & retrieval APIs · freemium
🔵

Real-time SERP scraping API returning structured JSON from Google and 20+ engines (maps, news, shopping, scholar).

Serper

Search & retrieval APIs · freemium
🔵

Fast, low-cost Google Search API returning structured JSON (organic, knowledge graph, news, images, places) for agents and SEO.

Tavily

Search & retrieval APIs · freemium
🔵 MCP

Web search, extract, crawl and map API built specifically for LLMs and AI agents, returning LLM-ready structured results.

Valyu

Search & retrieval APIs · freemium
🔵

Search API for agents unifying web plus 50+ proprietary sources (academic papers, SEC filings, financial data, clinical trials).

You.com API

Search & retrieval APIs · freemium
🔵 MCP

Real-time web search, page-contents, and multi-step research APIs for AI apps, with a free keyless MCP endpoint.

Voice, speech & video 19

Best voice, speech & video →

Text-to-speech, transcription, voice agents, and AI video/avatar APIs.

AssemblyAI

Voice, speech & video · freemium
🔵

Speech-to-text and audio-intelligence API — transcription, diarization, summarization, and LLM-over-audio (LeMUR).

Cartesia

Voice, speech & video · freemium
🔵

Sonic — ultra-low-latency (~90ms), emotive real-time text-to-speech and voice cloning for live voice agents.

D-ID

Voice, speech & video · freemium
🔵

Talking-avatar video API — turn a photo + text/audio into a lip-synced presenter, with real-time WebRTC streaming agents.

Deepgram

Voice, speech & video · freemium
🔵 MCP

Fast, accurate speech-to-text, text-to-speech, and voice-agent APIs built for real-time and batch at scale.

ElevenLabs

Voice, speech & video · freemium
🔵 MCP

Ultra-realistic text-to-speech, voice cloning, dubbing, and voice-agent APIs for developers and creators.

Fish Audio

Voice, speech & video · freemium
🔵

OpenAudio (S1/S2) text-to-speech and voice cloning — open models plus a hosted pay-as-you-go API.

Gladia

Voice, speech & video · freemium
🔵

Audio-infrastructure API for voice products — async and real-time speech-to-text with diarization and translation.

HeyGen

Voice, speech & video · usage based
🟡

Programmatic AI avatar video generation and video translation/dubbing with lip-sync, via a REST API.

Hume AI

Voice, speech & video · freemium
🔵

Empathic Voice Interface (EVI) and Octave TTS — emotionally intelligent, context-aware expressive speech.

LMNT

Voice, speech & video · freemium
🔵

Low-latency (150–200ms) multilingual text-to-speech with studio-quality voices and instant cloning.

PlayAI (PlayHT)

Voice, speech & video · freemium
🔵

Generative text-to-speech API with 900+ voices, instant voice cloning, and low-latency streaming for conversational AI.

Resemble AI

Voice, speech & video · freemium
🔵

Voice cloning and generative speech API, plus deepfake detection and audio watermarking, billed per second.

Retell AI

Voice, speech & video · usage based
🔵

Voice-agent API for AI phone calls — build, test, and deploy production call agents with usage-based per-minute pricing.

Rime

Voice, speech & video · freemium
🔵

Enterprise TTS with 200+ realistic voices, sub-200ms latency, and linguistically-aware markup for voice agents.

Speechmatics

Voice, speech & video · freemium
🔵

High-accuracy speech-to-text across 55+ languages, plus real-time transcription and the Flow voice-agent API.

Sync (sync. labs)

Voice, speech & video · freemium
🔵

Studio-grade AI lip-sync and visual dubbing API — retime any video's mouth to new audio in any language.

Synthesia

Voice, speech & video · paid
🟡

Studio-grade AI avatar video generation API — script-to-video with 200+ avatars, translation, and templates.

Tavus

Voice, speech & video · freemium
🔵

Conversational Video Interface (CVI) and Phoenix replica API — real-time, face-to-face AI video agents ('digital twins').

Vapi

Voice, speech & video · usage based
🔵

Developer-first platform to build, test, and deploy real-time voice AI agents with pluggable STT/LLM/TTS and telephony.

Email, SMS & voice comms 15

Best email, sms & voice comms →

Programmatic email, messaging, and phone infrastructure agents use to reach the world.

AgentMail

Email, SMS & voice comms · free tier
🟢

Email inbox API purpose-built for AI agents — programmatically create real inboxes that can send, receive, and reply in threads.

Bland AI

Email, SMS & voice comms · usage based
🔵

Enterprise voice-AI platform for phone agents — programmatically dial, converse, and transfer calls end to end.

Courier

Email, SMS & voice comms · freemium
🔵

Multi-channel notification API and orchestration for email, push, SMS, in-app, and chat with a single send call.

Knock

Email, SMS & voice comms · freemium
🔵

Notifications infrastructure for developers — orchestrate email, push, SMS, in-app, and chat from one workflow API.

Loops

Email, SMS & voice comms · freemium
🔵

Email platform for SaaS teams — marketing, lifecycle, and transactional email from one contact record and one API, with an agent-focused REST API.

Mailgun

Email, SMS & voice comms · free tier
🔵

Developer email API with HTTP + SMTP sending, routing, and inbound email parsing.

Nylas

Email, SMS & voice comms · freemium
🟢

Email, calendar, and contacts API — plus Agent Accounts that give an AI agent its own real inbox and calendar in one API call.

Plivo

Email, SMS & voice comms · usage based
🔵

Pay-as-you-go SMS, voice, and WhatsApp API with a fast developer onboarding path.

Postmark

Email, SMS & voice comms · free tier
🔵

Fast, reliable transactional email API and SMTP known for deliverability and long message history.

Resend

Email, SMS & voice comms · free tier
🔵 MCP

Developer-first transactional email API with a clean SDK, React email templates, and instant self-serve API keys.

Sinch

Email, SMS & voice comms · usage based
🟡

Enterprise communications APIs: SMS across 13+ channels, voice, email, video, and verification on one super-network.

Telnyx

Email, SMS & voice comms · usage based
🔵

Carrier-grade programmable messaging, voice, phone numbers, and voice-AI on a private global network.

Twilio

Email, SMS & voice comms · usage based
🟡 MCP

The market-standard programmable communications platform: SMS, voice, WhatsApp, verification, and phone numbers via API.

Twilio SendGrid

Email, SMS & voice comms · freemium
🟡

High-volume transactional and marketing email API (now part of Twilio), widely used at enterprise scale.

Vonage Communications APIs

Email, SMS & voice comms · usage based
🔵

SMS, messaging (WhatsApp/Viber), voice, and verification APIs from Vonage (Ericsson).

Data & enrichment 12

Best data & enrichment →

People/company intelligence, scraping, and structured web data for agents.

Apify

Data & enrichment · freemium
🔵 MCP

Marketplace and cloud runtime for thousands of ready-made scrapers ('Actors') that extract data from social media, maps, e-commerce, and any website.

Bright Data

Data & enrichment · usage based
🔵

Web-data platform with residential/datacenter proxies, Unlocker, SERP, Scraper APIs, and prebuilt datasets for large-scale collection.

Clay

Data & enrichment · freemium
🟡

Spreadsheet-style GTM platform that waterfalls 150+ data providers and AI research (Claygent) to enrich leads and build outbound systems.

Coresignal

Data & enrichment · paid
🔵

Workforce and company data via APIs and bulk datasets (firmographics, employees, funding, technographics) refreshed continuously.

Crustdata

Data & enrichment · freemium
🔵

Real-time B2B people and company data via APIs and webhooks (search, enrich, and Watcher signal alerts), built for AI agents.

Diffbot

Data & enrichment · freemium
🔵

AI web-extraction and a 10B+ entity Knowledge Graph of the public web (people, companies, articles) queryable via API.

Hunter.io

Data & enrichment · freemium
🔵

Email finder, verifier, and domain search API to turn names/domains into deliverable B2B contact data.

Oxylabs

Data & enrichment · usage based
🔵

Enterprise proxy network plus Web Scraper API that returns parsed data from complex and SERP targets at scale.

People Data Labs

Data & enrichment · freemium
🔵

B2B person and company data API over 900M+ profiles for enrichment, search, and identity resolution.

ScrapingBee

Data & enrichment · freemium
🔵

Web-scraping API that handles headless browsers, JS rendering, and proxy rotation so you get HTML/data without managing infrastructure.

Sixtyfour

Data & enrichment · freemium
🔵

AI research agents that enrich people and companies and surface real-time signals from a single API call, built for GTM teams and autonomous agents.

ZenRows

Data & enrichment · paid
🔵

Scraping API and scraping browser with anti-bot bypass, premium proxies, and JS rendering for hard-to-reach sites.

Browser automation 15

Best browser automation →

Cloud browsers and web-automation runtimes agents drive to act on the web.

Airtop

Browser automation · freemium
🔵

Cloud browser automation controlled with natural language, handling OAuth/2FA/CAPTCHA for sales, marketing and research agents.

Amazon Nova Act

Browser automation · usage based
🟡

AWS service + SDK for building reliable browser agents that automate production UI workflows, with an IDE extension and AWS deploy path.

Anchor Browser

Browser automation · freemium
🔵

Secure cloud browsers for computer-use agents, with strong support for authenticated sessions, MFA/SSO and infinite concurrency.

Bright Data Browser API

Browser automation · usage based
🟡

Enterprise-grade unblocking browser (Scraping Browser) with automatic CAPTCHA/fingerprint handling over a huge residential proxy network.

Browser Use

Browser automation · freemium
🔵

The popular open-source Python agent that drives a browser from natural language, now with a hosted cloud API and stealth browsers.

Browserbase

Browser automation · freemium
🔵 MCP

Managed fleet of headless cloud browsers with stealth, proxies and live view — the 'AWS for browsers' most agent frameworks run on.

Browserless

Browser automation · freemium
🔵

Battle-tested headless browser hosting (Chrome/Chromium) with Playwright/Puppeteer endpoints, BrowserQL and built-in CAPTCHA solving.

Hyperbrowser

Browser automation · freemium
🔵

Cloud Chrome sessions for agents with stealth fingerprinting, proxy rotation and auto-CAPTCHA, plus the open-source HyperAgent framework.

Kernel

Browser automation · freemium
🔵

Unikernel-based cloud browsers with sub-150ms cold starts and a full REST control plane (profiles, proxies, replays, computer-use).

Lightpanda

Browser automation · open source
🔵

An open-source headless browser written from scratch in Zig for AI/automation — ~11x faster and ~9x lighter than Chrome, CDP-compatible.

Notte

Browser automation · freemium
🔵

Browser platform for AI that turns any web workflow into a reliable, deployable API, with web agents and a perception layer for LLMs.

Scrapybara

Browser automation · freemium
🔵

API-driven virtual desktops (Ubuntu/Windows/browser) for agents — full OS + browser control with an Act SDK for computer-use models.

Skyvern

Browser automation · freemium
🔵

LLM + computer-vision browser automation that reads pages visually instead of brittle CSS selectors; open-source with a hosted cloud.

Stagehand

Browser automation · open source
🔵

Open-source SDK for browser agents (act/extract/observe/agent) that mixes natural-language and code; runs locally or on Browserbase.

Steel

Browser automation · freemium
🔵

Open-source headless browser API purpose-built for AI agents, with token-efficient content extraction and auth/session persistence.

LLM gateways & inference 18

Best llm gateways & inference →

Model routers, unified APIs, and fast hosted inference for open + frontier models.

Baseten

LLM gateways & inference · usage based
🔵

Production inference platform: per-token Model APIs plus dedicated GPU deployments for custom and open models.

Cerebras Inference

LLM gateways & inference · freemium
🔵

The fastest LLM inference in 2026 (1,800+ tokens/sec) on wafer-scale CS-3 chips, for open models like Llama and Qwen.

Cloudflare AI Gateway / Workers AI

LLM gateways & inference · freemium
🟢 MCP

Free edge AI gateway (caching, rate/spend limits, observability) in front of any provider, plus Workers AI for serverless model inference.

DeepInfra

LLM gateways & inference · usage based
🔵

Low-cost pay-per-use API for 50+ top open models via an OpenAI-compatible endpoint, no infra to manage.

Fireworks AI

LLM gateways & inference · usage based
🔵

Fast serverless inference for open models with serverless, on-demand, and reserved-capacity deployment tiers.

Groq (GroqCloud)

LLM gateways & inference · freemium
🔵

Ultra-fast inference on custom LPU chips (500+ tokens/sec) for open models like Llama, Qwen, and DeepSeek distills.

Hyperbolic

LLM gateways & inference · usage based
🔵

Open-access GPU and AI cloud with OpenAI-compatible serverless inference for 25+ open models plus on-demand GPU rental.

LiteLLM

LLM gateways & inference · open source
🟢

Open-source Python SDK + proxy server (AI gateway) that calls 100+ LLM APIs in OpenAI format with cost tracking, budgets, and virtual keys.

Modal

LLM gateways & inference · freemium
🟡

Serverless GPU/CPU cloud where you define container + hardware in Python code and run per-second-billed inference, batch, and training jobs.

Nebius AI Studio (Token Factory)

LLM gateways & inference · usage based
🔵

OpenAI-compatible inference and fine-tuning for open models with base/fast checkpoint variants and transparent per-token pricing.

Novita AI

LLM gateways & inference · usage based
🔵

AI-native cloud: serverless access to 200+ open models, dedicated endpoints, GPU instances, and agent sandboxes through unified APIs.

OpenRouter

LLM gateways & inference · usage based
🟢

A single OpenAI-compatible API that routes to 300+ LLMs from every major provider, with per-key budgets and programmatic key provisioning.

Portkey

LLM gateways & inference · freemium
🟢

Production AI gateway routing to 1,600+ LLMs with observability, guardrails, governance, and an MCP gateway in one API.

Replicate

LLM gateways & inference · usage based
🔵 MCP

Run thousands of community and official AI models (image, video, audio, LLM) via one HTTP API with no ML infra to manage.

SambaNova Cloud

LLM gateways & inference · freemium
🔵

Fast RDU-hardware inference for large open models (up to 405B) with an OpenAI-compatible API and a free developer tier.

Together AI

LLM gateways & inference · usage based
🔵

Serverless and dedicated inference for 200+ open models (Llama, DeepSeek, Qwen, FLUX) plus fine-tuning, aimed at production AI teams.

Vercel AI Gateway

LLM gateways & inference · freemium
🟢

One API key and endpoint to reach hundreds of models across providers, with zero markup, BYOK, budgets, and native AI SDK integration.

fal

LLM gateways & inference · usage based
🔵

Generative-media inference platform serving 600+ image/video/audio/3D models (FLUX, Kling, Sora) through one fast, queue-based API.

Agent auth & tool access 16

Best agent auth & tool access →

Let agents authenticate and take real actions in SaaS apps (OAuth, tool catalogs).

Anon

Agent auth & tool access · paid
🟡

User-permissioned auth layer that lets agents securely log into and act inside third-party apps that lack APIs (SSO, OAuth, 2FA) without ever storing user credentials.

Arcade

Agent auth & tool access · freemium
🔵

MCP runtime that handles OAuth and authorized tool-calling so AI agents can act on behalf of a specific user across 7,500+ agent-optimized tools.

Auth0 for AI Agents

Agent auth & tool access · freemium
🔵

Auth0's identity stack for GenAI: a Token Vault that stores and refreshes third-party OAuth tokens for agents, async (CIBA) human approvals, and fine-grained authorization for RAG.

Composio

Agent auth & tool access · freemium
🔵

Managed auth plus 1,000+ pre-authenticated toolkits that give AI agents per-user, scoped access to SaaS apps with automatic OAuth/token refresh.

Descope Agentic Identity Hub

Agent auth & tool access · freemium
🔵

Identity platform for AI agents and MCP: turn any app into an OAuth provider (Inbound Apps), vault and refresh third-party tokens, and give each agent a scoped identity.

Integration.app

Agent auth & tool access · freemium
🔵

AI-native integration platform with prebuilt connectors, configurable actions/flows and MCP so agents get authenticated, mapped access to your customers' SaaS apps.

Klavis AI

Agent auth & tool access · freemium
🔵 MCP

Hosted, production MCP servers with built-in OAuth and multi-tenant auth across 600+ tools, plus the open-source Strata server for self-hosting.

Merge Agent Handler

Agent auth & tool access · freemium
🔵

Gives agents secure, authenticated access to thousands of prebuilt tools across 220+ integrations via custom MCP servers, with enterprise governance and normalized data.

Nango

Agent auth & tool access · open source
🔵 MCP

Open-source integration platform providing OAuth, token refresh and credential storage for 800+ APIs, with each integration exposed to agents over MCP.

Paragon ActionKit

Agent auth & tool access · freemium
🔵

Unified integration API exposing 1,000+ prebuilt actions across 130+ connectors (plus an MCP server and triggers) so agents can act in CRMs, ticketing, email and messaging.

Pica (One)

Agent auth & tool access · freemium
🔵 MCP

Agent tooling platform (OneTool) connecting agents to 100+ APIs and 25,000+ actions through a single SDK, with AuthKit for managed auth; community edition is open source.

Pipedream Connect

Agent auth & tool access · freemium
🔵

Embedded integration API and managed auth that lets your app or agent connect accounts and run actions across 3,000+ apps on behalf of end users.

Scalekit

Agent auth & tool access · freemium
🔵

Modular auth stack for AI apps: puts an OAuth 2.1 authorization server in front of MCP servers, adds delegated agent identity and a token vault, plus enterprise SSO/SCIM.

Stytch Connected Apps

Agent auth & tool access · freemium
🔵

Turns your app into an OAuth 2.1/OIDC provider giving agents and MCP servers scoped, revocable, auditable access with a drop-in consent UI and human-in-the-loop approvals.

Toolhouse

Agent auth & tool access · freemium
🔵

Cloud tool infrastructure and Agent Studio that equip any LLM with hosted, low-latency tools (code exec, web, RAG, MCP) by wrapping your completion in a few lines.

WorkOS AuthKit

Agent auth & tool access · freemium
🔵

With one config value AuthKit becomes an MCP-compliant OAuth 2.1 authorization server; adds SSO, SCIM, audit logs and fine-grained tool-level authorization for agents.

Payments & billing 18

Best payments & billing →

Payments, usage billing, and agent-commerce rails for monetizing AI products.

Autumn

Payments & billing · freemium
🔵

Open-source pricing & billing layer over Stripe — one API for entitlements, credits and usage enforcement, built for AI startups.

Chargebee

Payments & billing · freemium
🔵

Subscription billing and monetization for B2B SaaS and AI companies — mix usage, credits, outcome-based and seat pricing on one billing record.

Coinbase x402

Payments & billing · open source
🟢

Open HTTP-native payment protocol that revives the '402 Payment Required' status code — agents and apps pay per API call in stablecoins with no account or login.

Crossmint

Payments & billing · freemium
🔵

Agent payments infrastructure — give each AI agent a wallet, virtual card and cross-chain stablecoin rails under human-controlled delegation.

Dodo Payments

Payments & billing · usage based
🔵

Merchant-of-Record payments and billing for AI-first companies — sell in 220+ countries with tax, compliance and disputes handled behind one API.

Google AP2 (Agent Payments Protocol)

Payments & billing · open source
🟢

Open protocol for agent-led payments — cryptographically-signed 'mandates' let agents transact on a user's behalf across cards, bank transfers and stablecoins (via the x402 extension).

Kill Bill

Payments & billing · open source
🔵

Mature open-source subscription billing and payments platform (Java) — self-host with a decade-deep plugin ecosystem for complex billing.

Lago

Payments & billing · open source
🔵

Open-source metering and usage-based billing API — consumption tracking, subscriptions, payment orchestration and revenue analytics, self-host or cloud.

Metronome

Payments & billing · paid
🟡

Usage-based billing and enterprise contract management for high-volume AI/software companies (now a Stripe company).

Orb

Payments & billing · paid
🟡

Usage-based billing and revenue platform for high-volume AI/software — event metering, price modeling and automated invoicing.

Paid

Payments & billing · unknown

Results/outcome-based billing for AI agents — attach value to what an agent does, track cost & margin, and invoice on outcomes.

PayPal Agent Toolkit

Payments & billing · open source
🔵 MCP

Open-source toolkit plus a remote MCP server that exposes PayPal payments, invoices, subscriptions, orders and disputes to AI agents.

Payman

Payments & billing · freemium
🔵

Agent-native wallet and payouts — let AI agents send and hold money under programmable, human-in-the-loop spend policies.

Polar

Payments & billing · usage based
🔵

Open-source Merchant of Record — payments, subscriptions and usage-based billing with global tax handled for you, built for the AI era.

Schematic

Payments & billing · freemium
🔵

Entitlements, feature gating and usage-based packaging on top of Stripe — ship pricing and plan changes without shipping code.

Skyfire

Payments & billing · usage based
🔵

Identity + payments rails for autonomous agents — Know-Your-Agent (KYA) identity, self-funded wallets and USDC micropayments via the open KYAPay protocol.

Stigg

Payments & billing · freemium
🔵

Pricing, packaging and entitlements runtime — the 'usage runtime' that decides what every customer, user and agent is allowed to do, with per-agent budget caps.

Stripe

Payments & billing · usage based
🟡 MCP

The default payments, billing and subscriptions API — now with an Agent Toolkit and Agentic Commerce suite so AI agents can accept and make payments.

Vector DB & data infra 16

Best vector db & data infra →

Managed vector databases and serverless data infra for RAG and agents.

Chroma Cloud

Vector DB & data infra · freemium
🔵 MCP

Fully-managed serverless hosting for the developer-favorite open-source Chroma, with the same API as local Chroma and per-database scoped keys.

Cloudflare Vectorize

Vector DB & data infra · freemium
🔵 MCP

Serverless vector database that runs on Cloudflare's global edge network, wired directly into Workers and Workers AI for low-latency RAG.

Convex

Vector DB & data infra · freemium
🔵

Reactive serverless backend-as-a-service with built-in vector search alongside your app data — well suited to real-time AI apps and agents.

LanceDB Cloud

Vector DB & data infra · freemium
🔵

Fully-managed serverless vector search for multimodal AI, built on the open-source Lance columnar format — pay only for storage you use.

MongoDB Atlas Vector Search

Vector DB & data infra · freemium
🟢 MCP

Vector search built into MongoDB Atlas so embeddings live next to your operational documents — free on the M0 tier, provisionable via the Atlas Admin API.

Neon

Vector DB & data infra · freemium
🟢 MCP

Serverless Postgres with pgvector plus a Claimable-Postgres API that spins up a live database with zero human involvement — purpose-built as a backend for apps and AI agents.

Pinecone

Vector DB & data infra · freemium
🟢 MCP

The managed serverless vector database most RAG teams reach for — autoscales to zero, with a control-plane Admin API for programmatic project and key provisioning.

Qdrant Cloud

Vector DB & data infra · freemium
🔵 MCP

Managed cloud for the popular open-source Qdrant vector engine, with a genuinely free-forever 1GB cluster (no credit card) and a cloud management API.

Redis Cloud

Vector DB & data infra · freemium
🔵 MCP

Managed Redis with a built-in query engine for vector, full-text, geospatial and hybrid search — real-time speed for agent memory and RAG.

Supabase Vector

Vector DB & data infra · freemium
🟢 MCP

Open-source Postgres backend where pgvector is included free on every plan, with a Management API and OAuth2 for programmatically creating and managing projects.

Tiger Cloud (Timescale / TigerData)

Vector DB & data infra · freemium
🔵

Managed Postgres tuned for scale with pgvector + pgvectorscale and hybrid vector/BM25 search — a Postgres-native RAG backend, no per-vector pricing.

Turbopuffer

Vector DB & data infra · usage based
🔵

Object-storage-native search engine offering vector + full-text search at roughly 10x lower cost than in-memory vector DBs, now with self-serve signup.

Upstash (Vector + Redis)

Vector DB & data infra · freemium
🟢 MCP

Serverless, HTTP-first Vector and Redis with pay-per-request pricing and a full Developer API + MCP server for provisioning databases from code or agents.

Vespa Cloud

Vector DB & data infra · usage based
🔵

Managed cloud for Vespa, the big-data search-and-inference platform combining vector search, ML-ranked retrieval and real-time inference at massive scale.

Weaviate Cloud

Vector DB & data infra · freemium
🔵

Managed cloud for the open-source Weaviate vector database, with built-in hybrid search and vectorizer modules and a free 14-day sandbox to start instantly.

Zilliz Cloud (Milvus)

Vector DB & data infra · freemium
🔵 MCP

The fully-managed cloud from the makers of Milvus — serverless vector search that scales to billions of vectors, with a free tier and startup credits.

Observability & evals (managed) 16

Best observability & evals (managed) →

Hosted tracing, monitoring, and evaluation platforms for LLM and agent systems.

Arize Phoenix / AX

Observability & evals (managed) · freemium
🔵 MCP

Open-source LLM/agent observability (Phoenix) plus Arize AX, the commercial platform for production monitoring and online evals.

Braintrust

Observability & evals (managed) · freemium
🔵

Eval-first AI platform unifying evaluations, tracing/logging and prompt playground for shipping quality AI products.

Comet Opik

Observability & evals (managed) · freemium
🔵

Open-source LLM tracing, LLM-as-a-judge evals and experiment management from Comet, with a managed cloud.

Confident AI (DeepEval)

Observability & evals (managed) · freemium
🔵

Cloud AI-quality platform on top of the open-source DeepEval framework: test management, tracing and analytics.

Datadog LLM Observability

Observability & evals (managed) · freemium
🔵

LLM/agent observability inside Datadog's APM suite, billing only on LLM spans with built-in online/offline evals.

Future AGI

Observability & evals (managed) · freemium
🔵

All-in-one evaluate/observe/improve platform for LLM and agent apps: tracing, evals, simulations, gateway and guardrails.

Galileo

Observability & evals (managed) · freemium
🔵

Enterprise AI evaluation + observability platform where offline evals become production guardrails (now part of Cisco).

HoneyHive

Observability & evals (managed) · freemium
🔵

OpenTelemetry-based observability and evaluation platform purpose-built for production AI agents.

LangSmith

Observability & evals (managed) · freemium
🔵 MCP

LangChain's managed tracing, evaluation and prompt-engineering platform for LLM and agent apps.

Langfuse Cloud

Observability & evals (managed) · freemium
🔵 MCP

Open-source-core LLM observability with tracing, evals, prompt management and playground, offered as a managed cloud.

Langtrace

Observability & evals (managed) · freemium
🔵

OpenTelemetry-native, open-source tracing and metrics for LLM, vector-DB and framework calls, with a hosted cloud.

Lunary

Observability & evals (managed) · freemium
🔵

Lightweight open-source LLM observability, prompt management and analytics, tuned for chatbots and RAG.

Maxim AI

Observability & evals (managed) · freemium
🔵

End-to-end GenAI platform to simulate, evaluate and observe agents, with prompt versioning and online evals.

PromptLayer

Observability & evals (managed) · freemium
🔵

Prompt management + LLM observability platform for versioning prompts, running evals and tracing agents in production.

Traceloop

Observability & evals (managed) · freemium
🔵

LLM reliability platform built on OpenLLMetry, an OpenTelemetry-native tracing layer for LLM apps.

W&B Weave

Observability & evals (managed) · freemium
🔵

Weights & Biases' LLM observability and evaluation toolkit that auto-traces calls and runs LLM-judge scorers.

Memory & context (managed) 12

Best memory & context (managed) →

Hosted long-term memory and context services for stateful agents.

Cloudflare Agent Memory

Memory & context (managed) · usage based
🟡

Managed persistent memory service for agents built on Durable Objects + Vectorize, handling extraction, storage, search, and summarization.

Graphlit

Memory & context (managed) · freemium
🟡 MCP

Cloud-native context layer that ingests documents, audio, video, and web data into semantic memory retrievable by agents via one API.

LangMem

Memory & context (managed) · open source
🔵

Open-source SDK from LangChain that gives LangGraph agents long-term memory (extraction, search, prompt optimization) in your own store.

Letta Cloud

Memory & context (managed) · usage based
🟡

Fully-managed API for stateful agents that manage their own memory like an OS (context = RAM, archival = disk) and self-improve over time.

Mem0 (Cloud)

Memory & context (managed) · freemium
🟢 MCP

Universal memory layer that adds persistent, personalized long-term memory to AI agents and apps in a few lines of code.

Memobase

Memory & context (managed) · freemium
🟡

User-profile-based long-term memory that batches conversations into structured profiles to personalize LLM apps cheaply and fast.

Pinecone Assistant

Memory & context (managed) · usage based
🟡 MCP

Managed knowledge/context layer on Pinecone that ingests files and serves grounded chat + context retrieval for production AI apps.

Redis Agent Memory Server

Memory & context (managed) · freemium
🟡 MCP

Redis-based dual-tier memory (working + long-term semantic) server and managed context engine for agents, with LangCache semantic caching.

Supermemory

Memory & context (managed) · usage based
🟡 MCP

Hosted universal memory API that stores, indexes, and retrieves long-term context, RAG, and user profiles for AI apps with one API.

Vertex AI Memory Bank

Memory & context (managed) · usage based
🟡

Google Cloud's managed long-term memory for agents (Agent Engine) that uses Gemini to extract facts and preferences scoped per user.

Zep Cloud

Memory & context (managed) · freemium
🟡 MCP

Temporal knowledge-graph memory for agents that tracks what was true and when, engineered from chat history and business data.

cognee

Memory & context (managed) · freemium
🟡 MCP

Open-source AI memory platform that builds a knowledge-graph-plus-vector memory for agents via a self-improving cognify pipeline.

Sandboxes & runtimes (managed) 11

Best sandboxes & runtimes (managed) →

Managed code sandboxes and execution environments for agent-written code.

Beam Cloud

Sandboxes & runtimes (managed) · usage based
🔵

On-demand serverless sandboxes (gVisor isolation) with GPU support, persistent snapshots, and an open-source core (beta9) you can self-host as BYOC.

Blaxel

Sandboxes & runtimes (managed) · usage based
🔵

Perpetual-sandbox agent runtime — spin up isolated sandboxes in milliseconds (resume ~25ms with memory intact), plus hosted agents, MCP servers, and batch jobs.

Cloudflare Sandboxes

Sandboxes & runtimes (managed) · usage based
🟡

GA (April 2026) container-backed sandboxes that give Workers-based agents a persistent isolated computer — exec, code interpreters, PTY terminals, backup/restore — on Cloudflare's edge.

CodeSandbox SDK

Sandboxes & runtimes (managed) · usage based
🔵

Programmatic API over CodeSandbox's microVMs that lets agents create, run, hibernate, and instantly fork() a live VM (with memory snapshot) for parallel/A-B agent runs.

Daytona

Sandboxes & runtimes (managed) · usage based
🔵

Elastic, stateful sandboxes for AI-generated code that cold-start in ~90ms, with parallel forking, snapshots, and SDKs in five languages.

Fly.io Machines

Sandboxes & runtimes (managed) · usage based
🟡

A REST API that boots ephemeral Firecracker microVMs from OCI containers in a few hundred ms — a low-level sandbox layer for agents (see also Fly Sprites).

Freestyle

Sandboxes & runtimes (managed) · freemium
🔵

Full Linux VMs plus Git for code your AI writes — serverless Runs bill per millisecond of execution and support external npm modules and env vars for agent code.

Morph Cloud

Sandboxes & runtimes (managed) · usage based
🔵

Sandbox VMs built around Infinibranch — snapshot, branch, and restore an entire running environment (files + processes + memory) in under 250ms for parallel agent forks.

Northflank

Sandboxes & runtimes (managed) · usage based
🔵

Developer platform with secure microVM sandboxes (Kata/gVisor) for multi-tenant AI code execution, self-serve BYOC across AWS/GCP/Azure and public pricing.

Runloop

Sandboxes & runtimes (managed) · freemium
🔵

Enterprise-grade Devboxes for AI coding agents on a custom bare-metal hypervisor — ~100ms command exec, ~25ms resume-from-standby at zero idle cost.

Vercel Sandbox

Sandboxes & runtimes (managed) · usage based
🔵

Ephemeral Firecracker microVMs for running untrusted/agent-generated code on Vercel — Node & Python runtimes, root access, persistent-by-default, millisecond starts.

Coding agents & devtools 15

Best coding agents & devtools →

Hosted coding agents, code-gen, and developer tools with APIs.

Aider

Coding agents & devtools · open source
🟡

Open-source terminal pair-programmer that edits your local git repo with AI — not hosted; you bring your own model key.

Amp (Sourcegraph)

Coding agents & devtools · usage based
🔵

Sourcegraph's agentic coding tool with a headless CLI and streaming-JSON output for automation — pay-as-you-go with no markup.

Bolt.new

Coding agents & devtools · freemium
🟡

StackBlitz's in-browser agent that prompts, runs, edits, and deploys full-stack apps using WebContainers — no local setup.

Cline

Coding agents & devtools · open source
🟡

Open-source autonomous coding agent (VS Code/JetBrains extension, CLI, and SDK) that runs on any LLM you plug in — fully BYOK.

Codegen

Coding agents & devtools · freemium
🔵

Cloud coding agents you run at scale via a Python SDK/REST API, wired into GitHub, Slack, and Linear to open PRs autonomously.

Cursor

Coding agents & devtools · freemium
🟡

AI code editor whose agent is now scriptable via a headless CLI, TypeScript SDK, and cloud Background Agents for developers and CI.

Devin (Cognition)

Coding agents & devtools · freemium
🟡

Autonomous software-engineer agent that runs long-horizon tasks in its own cloud VM and is triggerable via a REST API from CI, hooks, or cron.

Factory (Droid)

Coding agents & devtools · paid
🟡

Agent-native dev platform whose Droids run in managed cloud sandboxes; a headless `droid exec` CLI drops them into CI and scripts.

Jules (Google)

Coding agents & devtools · freemium
🔵

Google's async coding agent that works on your GitHub repo in a cloud VM, now with an alpha REST API for programmatic sessions.

Lovable

Coding agents & devtools · freemium
🟡

AI app builder that ships full-stack products from chat, with backend/auth/DB — popular with non-technical founders.

OpenAI Codex

Coding agents & devtools · freemium
🔵

OpenAI's coding agent across CLI, IDE, and cloud; `codex exec` runs headless and the gpt-5-codex models are callable via the OpenAI API.

Replit Agent

Coding agents & devtools · freemium
🟡

Browser-based agent that builds, runs, and deploys full apps end-to-end inside Replit's cloud IDE for non-technical builders.

Warp

Coding agents & devtools · freemium
🟡

Agentic terminal that runs multi-agent coding/debugging workflows from natural language, with BYOK model support on every plan.

Windsurf

Coding agents & devtools · freemium
🟡

Agentic IDE (formerly Codeium) whose Cascade agent does multi-file, codebase-aware autonomous edits.

v0 by Vercel

Coding agents & devtools · freemium
🔵

Vercel's generative UI/app agent with a real Platform API (TypeScript SDK + REST) to create chats and generate React/frontend code programmatically.

Orchestration & workflows 17

Best orchestration & workflows →

Durable execution and workflow platforms for long-running agent pipelines.

AWS Step Functions

Orchestration & workflows · usage based
🟡 MCP

Serverless visual workflow orchestrator for AWS — coordinate Lambda, containers, and 200+ services as durable state machines with built-in retries, error handling, and history.

Cloudflare Workflows

Orchestration & workflows · freemium
🔵 MCP

Serverless durable-execution engine on Cloudflare Workers for long-running, multi-step apps and AI agents — steps persist across failures, sleeps, and retries at the edge.

DBOS Cloud

Orchestration & workflows · freemium
🔵

Postgres-backed durable execution as a library — annotate ordinary Python/TS/Go/Java code with decorators to get exactly-once workflows, queues, and recovery, hosted serverlessly on DBOS Cloud.

Dagster+

Orchestration & workflows · usage based
🔵

Managed, asset-based orchestration for data, ML, and AI pipelines — declarative software-defined assets with lineage, scheduling, and serverless or hybrid compute.

Hatchet

Orchestration & workflows · freemium
🔵

Postgres-backed orchestration engine for background tasks, AI agents, and durable workflows — a high-throughput task queue with retries, DAGs, and real-time monitoring.

Inngest

Orchestration & workflows · freemium
🔵 MCP

Event-driven durable functions and AI workflows for TypeScript/Python/Go — steps, retries, sleeps, and flow control with zero queues to run.

Kestra Cloud

Orchestration & workflows · freemium
🔵

Managed hosting for Kestra, the declarative YAML-based orchestration platform — event-driven data and infra workflows with 600+ plugins and a code-friendly UI.

LangGraph Platform (LangSmith Deployment)

Orchestration & workflows · freemium
🔵

Managed deployment and orchestration for stateful LangGraph agents — persistence, human-in-the-loop, streaming, and horizontal scaling for production AI agents.

Mastra Cloud

Orchestration & workflows · free tier
🔵 MCP

One-command managed deployment for Mastra, the TypeScript AI-agent framework — agents, tools, workflows, and memory with routing, scaling, and tracing handled for you.

Orkes Conductor

Orchestration & workflows · freemium
🔵

Managed, enterprise Netflix Conductor — a distributed orchestration platform for microservices, workflows, and AI agents with a visual builder and multi-language SDKs.

Pipedream (Workflows + Connect)

Orchestration & workflows · freemium
🟢 MCP

Workflow automation plus Connect — SDKs/APIs that let your app or AI agent add 2,500+ integrations and provision end-user account connections and OAuth tokens programmatically.

Prefect Cloud

Orchestration & workflows · freemium
🔵

Python-native workflow orchestration for data, ML, and agents — turn functions into observable, retryable flows with scheduling, and a managed control plane plus MCP gateway.

Restate

Orchestration & workflows · usage based
🔵

Durable-execution runtime for resilient services, workflows, and AI agents — durable RPC, virtual objects, and state, deployable on serverless (Cloudflare/Vercel/Deno) or as managed Restate Cloud.

Temporal Cloud

Orchestration & workflows · usage based
🟢

Fully managed durable-execution platform where you write Workflows as ordinary code that survive crashes, retries, and multi-day sleeps.

Trigger.dev

Orchestration & workflows · freemium
🔵

Open-source TypeScript platform for long-running background tasks and AI agents with retries, queues, concurrency, and observability, fully managed in the cloud.

Windmill

Orchestration & workflows · freemium
🔵

Open-source developer platform that turns scripts (TS/Python/Go/Bash/SQL) into workflows, webhooks, and internal UIs — a fast workflow engine and Retool/Temporal alternative.

n8n Cloud

Orchestration & workflows · freemium
🟡 MCP

Managed hosting for n8n, the fair-code visual workflow automation and AI-agent builder with 400+ integrations, native AI/LangChain nodes, and an MCP server.

Document parsing & extraction 4

Best document parsing & extraction →

Turn messy PDFs, scans, and spreadsheets into structured, LLM-ready data for RAG and extraction pipelines.

Docling

Document parsing & extraction · Python
★ 64k

IBM's MIT-licensed document parser — runs DocLayNet layout and TableFormer table models locally on commodity hardware, no cloud egress.

Unstructured

Document parsing & extraction · Python
★ 15k

Open-source library that turns 25+ file types into semantically labeled elements (title, table, list) with positions — the preprocessing layer for RAG ingestion.

LlamaParse

Document parsing & extraction · freemium
🔵

LlamaIndex's managed document parser — per-page tiers from fast heuristics to VLM-agentic, with native LlamaIndex ingestion for RAG.

Reducto

Document parsing & extraction · freemium
🔵

Agentic document parsing — layout-aware vision + VLMs + a multi-pass correction loop turn messy PDFs, scans, and spreadsheets into structured, RAG-ready data.

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