The best observability & evals (managed) for AI agents

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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