A dev machine in your browser, in seconds.

devbox.new boots a fresh cloud Linux box with tmux, git, node, python, claude, and codex preinstalled. Sign in with your cmux account and start typing.

root@devbox:~# uname -a Linux devbox 6.8.0 x86_64 GNU/Linux · 4 vCPU · 8 GB root@devbox:~# claude Claude Code ready. root@devbox:~# ▍

Ready in about a secondVMs boot from a prebaked snapshot, no provisioning wait.

Survives reconnectsThe terminal runs in tmux. Close the tab, come back, keep going.

Suspends when idleYour devbox sleeps after 30 minutes and wakes when you return.