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

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

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21st
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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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Serafim
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!
Austin Heaton

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

Sergey Bunas
Maker

@serafimcloud  @austin_heaton 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

Mohsin Ali ✪

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

Ankur Madharia

@serafimcloud 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!

Harsh Sahu

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

Dima Sukharev

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

Sergey Bunas
Maker

@sukharev made it for you!

Anton Tishchenko

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

Sergey Bunas
Maker

@anton_tishchenko 1Code uses the official Claude Code SDK 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.

Sayyid Ali

NO WAY!!!

LOVE IT SO MUCH

Sergey Bunas
Maker
Elior

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

Sergey Bunas
Maker

@zeiki_yu thanks!

Samet Sezer

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?

Boris Gostroverhov

Wow!

Anna N

what a launch!!!

Sergey Bunas
Maker

@a_6 🚀🚀🚀

Michael Vavilov

Who is your target audience?
Congrats on your launch!

Sergey Bunas
Maker

@michael_vavilov people who want to utilize Claude Codes more efficiently

Vlad Nadymov

Niiiiice @serafimcloud @serjobas 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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