sandboxed

The open-source engine for AI app-builder products.
Give every user an isolated cloud dev environment, a built-in coding agent, and a live preview URL — self-hosted, on one machine, in one command.

What is sandboxed? (start here)

Think of the apps where you type "build me a todo app" and seconds later a working website appears at its own link — like Lovable, Bolt, v0, or Replit. sandboxed is the open-source backend that makes that possible, running on your own server.

Here's what it does, in plain terms. You send it one HTTP request, and it:

1. Creates a sandbox — a private, isolated Linux container (its own filesystem, its own memory limits), so one user's code can never see or break another's.
2. Runs an AI coding agent inside it — you give it a prompt, and it writes the code into that sandbox. (The OpenCode and Claude Code CLIs come pre-installed.)
3. Gives the app a live URL — the dev server running inside the sandbox is instantly reachable at a shareable preview link.

POST /sandbox          → a private, isolated container spins up
POST .../tasks         → an AI agent writes an app inside it
http://.preview... → that app is live at its own URL

It's also cheap to run: a sandbox goes to sleep when nobody's using it (freeing memory) and wakes up the instant someone opens its link again — files are saved o