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.dev
•
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
21st.dev
Maker
📌
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
21st.dev
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

Dima Sukharev
OpenCommit: git commit message by AI

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

Sergey Bunas
21st.dev
Maker

@sukharev made it for you!

Sayyid Ali Aljufri⚡

NO WAY!!!

LOVE IT SO MUCH

Sergey Bunas
21st.dev
Maker
Zeiki Yu

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

Sergey Bunas
21st.dev
Maker

@zeiki_yu thanks!

Boris Gostroverhov
ProblemHunt

Wow!

Anna N

what a launch!!!

Sergey Bunas
21st.dev
Maker

@a_6 🚀🚀🚀

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 (:

Alexander Nevedovsky
No Cap

Amazing, much needed

Urvashi Misal

This is a solid and timely contribution to the AI coding space. Running multiple Claude Code agents in parallel with both local and remote sandbox support is a strong productivity unlock, especially with live previews across devices. The open source approach also signals long term intent and trust. Insight wise, parallel agents change not just speed but how developers reason about progress and ownership across tasks. From a technical and onboarding perspective, how do you coordinate state, conflicts, and context sharing between parallel agents, and what signals do you surface to help new users understand which agent is doing what during their first sessions?

Cruise Chen
Agnes AI

Nice try for 1code! Obviously Open Source is the SPIRIT!!!

Sergey Bunas
21st.dev
Maker

@cruise_chen yes siiir!!

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