Claude Code Open
Open-source AI coding platform with Web IDE and multi-agent
What it does
Claude Code Open is a free, open-source AI coding assistant that runs in your terminal and browser. Built with TypeScript, it features a Web IDE with Monaco Editor, 37+ built-in tools for file ops, code analysis, git, and web access, plus a multi-agent Blueprint system that breaks complex tasks into parallel subtasks. Supports MCP protocol, background task scheduling, and runs on Windows/macOS/Linux. MIT licensed.
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Claude Code ReviewMar 2026 · claude.com · ▲549Multi-agent review catching bugs early in AI-generated code
Claude Code Desktop App RedesignedApr 2026 · claude.com · ▲565Run parallel coding agents from one desktop workspace
- OSOpen-source CLI coding framework using Claude2024 · github.com · ▲84
- 1O1Code – Open-source Cursor-like UI for Claude CodeJan 2026 · github.com · ▲75
Hi, we're Sergey and Serafim. We've been building dev tools at 21st.dev and recently open-sourced 1Code (https://1code.dev), a local UI for Claude Code. Here's a video of the product: https://www.youtube.com/watch?v=Sgk9Z-nAjC0 Claude Code has been our go-to for 4 months. When Opus 4.5 dropped, parallel agents stopped needing so much babysitting. We started trusting it with more: building features end to end, adding tests, refactors. Stuff you'd normally hand off to a developer. We started running 3-4 at once. Then the CLI became annoying: too many terminals, hard to…
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