ThinkRail is an open-source agentic IDE from the JetBrains InnovationHub built around the pi coding agent.
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Each workspace is an isolated git worktree with its own branch, editor tabs, terminals and concurrent agent chats, and a graph of living SPEC.md files gives the agent durable project knowledge across sessions.
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Isolated git-worktree workspaces with parallel pi chats, per-session models and live token and cost readouts
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Monaco editor tabs, Files tree with git change marks, terminals, diffs and anchored review comments sent to chat
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Living SPEC.md spec graph the agent reads and maintains through dedicated spec tools
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Reuses existing Agent Skills and connects MCP servers with approval prompts and OAuth sign-in
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Publish, push, open and merge GitHub pull requests with CI checks via your own gh CLI
Open Source
Free and open source under the Apache-2.0 license; no ThinkRail account, you bring JetBrains AI or any provider configured through pi.
Best for
Developers who want a lightweight, real IDE around a terminal coding agent with parallel worktree workspaces and persistent project specs.
Not ideal for
Intel Mac desktop users and teams that want a polished, extension-rich IDE today; full extension support is still on the roadmap.
An early but serious JetBrains bet on spec-driven agentic coding that pairs pi with a genuine editor and worktree isolation, worth trying for pi users.
Trending on GitHub and discussed on Hacker News in October 2026; v0.2.0 shipped on October 18, 2026 with v0.3.0 nightly builds following.
As of
Is ThinkRail free?+
Yes - ThinkRail is Open Source. Free and open source under the Apache-2.0 license; no ThinkRail account, you bring JetBrains AI or any provider configured through pi.
Is ThinkRail open source?+
Yes - ThinkRail is open source. Free and open source under the Apache-2.0 license; no ThinkRail account, you bring JetBrains AI or any provider configured through pi.
Who is ThinkRail best for?+
Developers who want a lightweight, real IDE around a terminal coding agent with parallel worktree workspaces and persistent project specs.
Who is ThinkRail not ideal for?+
Intel Mac desktop users and teams that want a polished, extension-rich IDE today; full extension support is still on the roadmap.
What are the best ThinkRail alternatives?+
The closest ThinkRail alternatives on ai.dosa.dev are Cursor, Devin, TRAE - all listed under AI-Native IDEs & Editors.
Who makes ThinkRail?+
ThinkRail is developed by JetBrains. It is listed in the AI-Native IDEs & Editors category on ai.dosa.dev.
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