T3 Code is an open-source "agent harness control surface" from Theo and Julius that controls the coding-agent CLIs on your machine from a web app, an Electron desktop app and iOS/Android mobile apps.
A Node WebSocket server wraps the provider CLIs so you can run parallel agent threads across projects and worktrees with your existing subscriptions.
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Drives Codex, Claude Code, Cursor, Grok Build and OpenCode with your existing subscriptions
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Web, Electron desktop and iOS/Android clients with remote access from a phone
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Each agent thread works on its own branch with inline diff review
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One-button commit, push and PR with generated titles, bodies and changelogs
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Permission modes, multiple accounts and `npx t3@latest` quick start
Open Source
T3 Code is free and open source under the MIT license; it does not resell tokens and instead uses the Codex, Claude Code, Cursor, Grok Build or OpenCode subscriptions you already have.
Best for
Developers who run several coding-agent CLIs in parallel and want one open, forkable GUI to manage threads, diffs and PRs.
Not ideal for
Teams that want a hosted agent with bundled model access, since T3 Code requires installing and authenticating provider CLIs yourself.
A fast-moving, fully open alternative to Codex App, Claude Desktop and Conductor for orchestrating the agents you already pay for.
T3 Code shipped v0.0.44 on September 29, 2026 and v0.0.45 on October 2, 2026, with v0.0.46 preview and nightly builds following on October 2-3, 2026.
As of
Is T3 Code free?+
Yes - T3 Code is Open Source. T3 Code is free and open source under the MIT license; it does not resell tokens and instead uses the Codex, Claude Code, Cursor, Grok Build or OpenCode subscriptions you already have.
Is T3 Code open source?+
Yes - T3 Code is open source. T3 Code is free and open source under the MIT license; it does not resell tokens and instead uses the Codex, Claude Code, Cursor, Grok Build or OpenCode subscriptions you already have.
Who is T3 Code best for?+
Developers who run several coding-agent CLIs in parallel and want one open, forkable GUI to manage threads, diffs and PRs.
Who is T3 Code not ideal for?+
Teams that want a hosted agent with bundled model access, since T3 Code requires installing and authenticating provider CLIs yourself.
What are the best T3 Code alternatives?+
The closest T3 Code alternatives on ai.dosa.dev are Cursor, Devin, Trae - all listed under AI-Native IDEs & Editors.
Who makes T3 Code?+
T3 Code is developed by Ping.gg. It is listed in the AI-Native IDEs & Editors category on ai.dosa.dev.
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