Boxes.dev

Boxes.dev is a cloud development environment built specifically for AI coding agents. Instead of running Codex or Claude Code on your local machine, Boxes.dev gives each agent thread its own full Linux VM in the cloud — with its own filesystem, services, ports, and database state. You can spin up multiple isolated "forks" from your main devbox, run agents in parallel, and leave them working even after you close your laptop. The tool works with the same Codex or Claude Code subscription you already use, and supports desktop (macOS), mobile (iOS, Android), web, and CLI access.

What makes Boxes.dev stand out is how it handles agent isolation and persistence. Each fork is a real computer, not just a git worktree — so agents can run the full app, take screenshots, test changes, and leave reviewable work behind. The desktop workbench shows a thread list with fork groups and live status, an integrated file viewer with diff mode, inline review comments, and persistent terminal sessions that survive disconnects. You can also set up automations: schedule weekly dependency audits, trigger threads from Slack or Linear, or have agents open PRs when work is done. Idle forks sleep automatically, so you only pay for compute time when agents are actually running.

Boxes.dev is most useful for developers who already use AI coding agents and want to run multiple tasks in parallel without bogging down their local machine. It's also handy for teams that need agents to keep working overnight or while someone is away. The free tier includes 10 box-hours, and paid plans start at $19 per user per month for 40 included hours. If you've ever wanted to kick off five agent tasks at once and come back to reviewable results in the morning, Boxes.dev makes that straightforward.