Your editor and command line
Use VS Code in the browser or connect your desktop editor through the bridge. The web terminal supports TUI tools and TMUX, so you can work with the commands you already know.
Bring your repository
Your stack,ready to run.
Bring the TypeScript, Python, .NET or other project you already work on. Run its services, investigate a failing test or hand a feature to a coding agent. Your code, terminal and app preview are together in the browser.
Animated sandbox demo showing an existing repository detected, started and fixed by a coding agent.
Your tools
Your stack
- Open Mercato
- cezar
- Claude Code
- Codex
- Python
- .NET
- PostgreSQL
- MySQL
- MongoDB
- Node.js
- TypeScript
- React
- Next.js
- Repository
Take a real task through to a pull request.
A checkout test is failing. Open the repository, reproduce the problem and let an agent work on the fix. You can inspect the changes and try the checkout in the same environment before deciding what to keep.
01 repo.connect()
Open your project
Clone it from GitHub. For something new, choose a template or start with a blank sandbox.
02 stack.boot()
Reproduce the problem
Start the database and services, run migrations and check the failing test in the terminal.
03 agent.assign()
Work on the fix
Give Claude Code, Codex, OpenCode or your own CLI agent the task. Edit the code yourself whenever you need to.
04 git.keep()
Review and keep it
Try the result in the preview, inspect the diff and commit to your branch. Open a pull request or export the source and database.
Work the way you usually do.
An agent when you need one
Claude Code, Codex and OpenCode are installed and authenticated. Give one a specific job, such as investigating a test failure, while you inspect the app. Other CLI agents are supported too.
A running app to check
See your edits in the live preview. When you want another person's feedback, share the preview link and add a password if needed.
Code you can take with you
Use GitHub for cloning, commits, pushes and pull requests. You can also download the source and database to continue working elsewhere.
Developer Sandbox
One seat. Unlimited sandboxes.
The first month includes 75 Hardware Credits and a one-time $25 AI Credits Starter.
$75first month
Then $95 per seat/month with 95 HC included per seat monthly. HC and AI top-ups are sold separately. Applicable tax is shown before purchase.
Create your Sandbox