The strongest open-source alternatives to Bolt.new for building AI agents — coding agents & devtools ranked by GitHub traction, each with a head-to-head.
Short answer: the closest alternative to Bolt.new is Aider (★ 0), the most-starred coding agents & devtools; Amp (Sourcegraph) and Cline are also strong.
Bolt.new (★ 0) is StackBlitz's in-browser agent that prompts, runs, edits, and deploys full-stack apps using WebContainers — no local setup. If it is not the right fit, these 14 coding agents & devtools cover the same ground — Aider is the most-starred option below. Or browse the best coding agents & devtools and Bolt.new's own page.
Open-source terminal pair-programmer that edits your local git repo with AI — not hosted; you bring your own model key. Best for agent builders.
Sourcegraph's agentic coding tool with a headless CLI and streaming-JSON output for automation — pay-as-you-go with no markup. Best for agent builders.
Open-source autonomous coding agent (VS Code/JetBrains extension, CLI, and SDK) that runs on any LLM you plug in — fully BYOK. Best for agent builders.
Cloud coding agents you run at scale via a Python SDK/REST API, wired into GitHub, Slack, and Linear to open PRs autonomously. Best for agent builders.
AI code editor whose agent is now scriptable via a headless CLI, TypeScript SDK, and cloud Background Agents for developers and CI. Best for agent builders.
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. Best for agent builders.
Agent-native dev platform whose Droids run in managed cloud sandboxes; a headless `droid exec` CLI drops them into CI and scripts. Best for agent builders.
Google's async coding agent that works on your GitHub repo in a cloud VM, now with an alpha REST API for programmatic sessions. Best for agent builders.
AI app builder that ships full-stack products from chat, with backend/auth/DB — popular with non-technical founders. Best for agent builders.
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. Best for agent builders.
Browser-based agent that builds, runs, and deploys full apps end-to-end inside Replit's cloud IDE for non-technical builders. Best for agent builders.
Agentic terminal that runs multi-agent coding/debugging workflows from natural language, with BYOK model support on every plan. Best for agent builders.
Agentic IDE (formerly Codeium) whose Cascade agent does multi-file, codebase-aware autonomous edits. Best for agent builders.
Vercel's generative UI/app agent with a real Platform API (TypeScript SDK + REST) to create chats and generate React/frontend code programmatically. Best for agent builders.
Aider (★ 0) is the most-starred coding agents & devtools alternative to Bolt.new. Open-source terminal pair-programmer that edits your local git repo with AI — not hosted; you bring your own model key.
The strongest coding agents & devtools alternatives to Bolt.new are Aider, Amp (Sourcegraph), Cline, Codegen and more — each with a head-to-head comparison.
Yes — the alternatives listed are open source and free to self-host; you bring your own model keys.
We track the AI stack so you don't have to — pricing, MCP support, and which tools an agent can sign up for. Free.