1Code
Open source Cursor-like UI for Claude Code
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1Code - Open source Cursor-like UI for Claude Code

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Whats 1Code? An app to run your Claude Code agents in parallel that works on Mac and Web. On Mac - run locally, with or without worktrees. On Web - run in remote sandboxes with live previews of your app, mobile included, so you can check on agents from anywhere. Running multiple Claude Codes in parallel dramatically sped up how we build features.

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Maker
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Hi It’s Serafim and Sergey from 21st.dev, in the last 10 months we’ve built and launched 9 products, getting over 1 millions total users, $200k in revenue, and 10k GitHub stars. Motivation Claude Code has been our go-to for 4 months. When Opus 4.5 dropped, parallel agents stopped needing babysitting. You could finally run multiple and trust them. But the more agents we ran, the more the CLI felt like a limitation, not a feature. So we built 1Code.dev What’s next: Bug bot for identifying issues based on your changes; QA Agent, that check that new features dont break anything Adding OpenCode, Codex, other models and coding agents. API for starting Claude Codes in remote sandboxes. Debugging and spotting errors in AI Coding Era is more critical than ever Try it: We're open-source, so you can just bun build it. Paid tiers exist too - for us it’s gonna be highest signal that we're on the right track. Either way, we'd love to hear your feedback!

 congrats on the launch! Does it work with the regular Anthropic subscription as well, or only Claude Code?

Maker

   since we're utilizing Claude Code CLI under the hood, we accept everything that Claude Code CLI accepts, and as I know they only work either with API key or with Claude Code subscription

 Such a necessary step! Are you keeping it as a UI layer or planning to add your own logic on top?

 for this. How do you manage around the 5 hour and weekly limits? For us 2 devs, in 2 projects, it gets exhausted all the time. So that's a challenge I don't have an answer to!

 Parallel agents only matter once you can trust them.
GTWY is built around the same idea: scale intelligence by making execution predictable, not fragile.

finally.. the TUI always jumps and jiggles, idk why anthropic cant fix it

Maker

 made it for you!

Will Anthropic ban it similarly to Open Code once it becomes popular?

Maker

 1Code uses the official which wraps the Claude Code binary. This is the official way to build on top of Claude Code.

Some other tools (like OpenCode) made direct API calls while impersonating Claude Code - that approach got banned. We're not doing that.

NO WAY!!!

LOVE IT SO MUCH

Maker

Huge congrats on the launch! Love the focused, parallel Claude Code workflow for serious shipping.

Maker

 thanks!

Running multiple Claude Code agents in parallel is a massive unlock for velocity compared to serial chats. How does the system handle conflict resolution if two agents try to edit the same file structure simultaneously?

Wow!

what a launch!!!

Maker

 🚀🚀🚀

Who is your target audience?
Congrats on your launch!

Maker

 people who want to utilize Claude Codes more efficiently

Niiiiice it got even better than the alpha versions that I've tested. Waiting for browser preview so I don't have to jump between agents and my browser anymore (:

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