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21st.dev

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About 21st.dev

21st.dev builds 1Code, a visual client for AI coding agents like Claude Code and Codex. The team is backed by Y Combinator and ships tools designed for developers who want to move fast without sacrificing clarity. 1Code is open source and supports parallel agent workflows, built-in Git, and MCP integrations out of the box.

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1 AI Tool by 21st.dev

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1Code

13h
AI Coding Asst.

A visual desktop and web client for running Claude Code and Codex agents in parallel, with built-in Git integration, background agents, and MCP support.

1Code
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