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.
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!
Wow, 1Code looks incredible! The live preview feature for mobile apps while running agents is a game changer. How does the remote sandboxing handle file access for more complex projects?
The parallel agent problem so real. Curious how you're handling conflict resolution when agents touch the same files?
If a user already has Cursor (or another agentic editor) plus a couple terminal tabs, what’s the strongest reason they’d switch to 1Code instead of staying in their editor—what workflow becomes materially faster or safer only when you add a dedicated multi-agent “control plane”?
9 products, 1 million users, $200k revenue... And I still can't figure out how to fix my Wi-Fi. :D But seriously, 1Code looks super amazing!
That's crazy. I've just given in and bought Claude code today after an infuriating few days with Cursor. Feels like Cursor is dead unfortunately, it was a great run. Very excited to try this out, hope you're going to maintain and push this forward!
Finally something to not be scared of worktrees
Congrats on the launch!
Sounds really cool! Gonna check it out and return with a feedback
GL with your launch 🤟
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?
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?
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 (:
What’s next: Adding OpenCode, Codex, other models and coding agents.
Anthropic better acquire this company before everyone switches to 1Code and the Claude Code backend gets quietly replaced 😳
