Hi, it's Sergey and Serafim from 21st (W26).

In the last 10 months we've built and launched 9 products, getting over 1 million total users and 15K GitHub stars.

tldr: we build 1Code- control panel for running claude codes in parallel, automate PR reviews, Linear tickets, CI fixes.

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 we outgrew the CLI. Juggling terminal tabs, no visual diffs, no way to run agents in parallel without everything colliding. So we built the 1Code App.

Then our users started asking – can this thing just review my PRs? Pick up Linear tickets? Fix CI when it breaks? So we built Automations.

Then users wanted to trigger Claude Code from anywhere – CI hooks, Slack bots, custom workflows. So we built the API.

What's 1Code?

https://youtu.be/mERQ55XujEI?si=kd0qoE6wYafFGmxS

1. The App – a control panel for coding agents

Run Claude Code agents in parallel, locally or in the cloud.

• On Mac – run locally, with or without worktrees. Each agent gets its own git branch so they never collide. Split view lets you watch up to 6 agents side by side. Built-in git client, PR management, keyboard shortcuts for everything.
• On Web – run in remote sandboxes with live previews of your app, mobile included. Close your laptop, check on agents from anywhere.

2. Automations around Claude Code

Connect your repos, set up triggers, and let Claude Codes work on your codebase continuously in a remote sandboxes, then continue locally (syncing your sandbox state with your computer).

• PR Reviews – 1Code reviews every PR reading full codebase context. It doesn't just leave comments – it pushes fix commits directly. Tag @1code to keep iterating.
• Linear to PR – assign a ticket, agent picks it up, implements it, runs your tests, fixes what fails, and opens a PR when it's green.
• CI/CD Fixes – build breaks, agent reads the logs, writes a fix, runs tests again. Keeps going until green or asks for help.

All runs are persistent – come back to any agent run later and continue where you left off, full context intact.

The desktop app lets you jump in and work alongside the agent on your machine.

3. The API – spin up Claude Code in a remote sandbox with one POST call

Give it a repo and a task. We handle the sandbox, security, Claude Code updates, retries, cleanup – all of it.

Configure what goes into the sandbox – add integrations like gh CLI, Notion MCP, Sentry, Slack, or any MCP server your agents need. Build your own triggers on top: CI hooks, Slack bots, cron jobs, whatever. Self-hosted option available.

Try it:

$20/mo – Claude Code desktop UI and web app.

$100/mo – Automations, API, and everything above.

https://1code.dev

P.S: If you're thinking about plugging Claude Code into your workflow – custom automations, self-hosted, whatever – happy to hop on a call and figure it out: https://cal.com/team/21st/1code