Cloud dev environments that feel like localhost

Claude Code or Codex run on your laptop, and use the Tesser CLI to give each worktree its own VM and run the dev server and the tests up there. To interact, open localhost:3000, and select which server you're connected to.

curl -fsSL https://tesser.sh/install | sh

Offload localhost to the cloud

Run as many worktrees as you want without frying your laptop.

Point localhost:3000 at any worktree in one click

Every worktree on port 3000, however many are running
Two branches side by side at <box_id>.localhost:3000
Cookies and OAuth callbacks survive the switch

Idle VMs put themselves to sleep

Asleep after 2 hours idleAwake again in 40 seconds, everything still installed

Tests and builds run on the VM, not on your laptop

tesser exec -- pnpm test runs on the worktree's VM
Output streams back with the real exit code
tesser skill install teaches your agent the commands

Run it in our cloud or your own AWS account

Ubuntu 24.04 with Node and Docker preinstalledUp to 8 vCPU and 32 GB per VM

Get started

Install the CLI and follow the quickstart to get your first cloud environment up and running.

curl -fsSL https://tesser.sh/install | sh