Open MercatoSandbox
Sign up
Menu

Sandboxes run by agents

Build apps on any tech stack using coding agents. Start a sandbox in 30 seconds with Open Mercato, Python, TypeScript or .NET. All you need is a browser: hosting, coding agents and an IDE are included.

Skip the setup. Give it a task.

Agents are good on a blank repo and awkward on a running system: services in order, migrations, a database with enough data that a wrong change is visible. A sandbox is that afternoon of setup, already spent.

Open Mercato Sandbox workspace with a coding agent and a running app.
Watch on YouTube

Inside your sandbox

Ready in 30 seconds.

Production-grade apps in 1–2 hours.

Any tech stack, supported

Bring your repository and work with the stack you already use.

Open Mercato, built in

The full framework in dev mode. Business rules, permissions and data, already in place.

Your work, yours to keep

Preview changes live. Share a protected link, push to GitHub or export your code and data.

  • Open Mercato
  • cezar
  • Claude Code
  • Codex
  • Python
  • .NET
  • PostgreSQL
  • MySQL
  • MongoDB
  • Node.js
  • TypeScript
  • React
  • Next.js
  • Repository
  • VS Code
  • OpenRouter
  • MikroORM
  • Redis
  • Meilisearch
Explore the full specification
Tech stack

Bring your own repository and use TypeScript, Next.js, React, Python, .NET or another tech stack.

Framework

Open Mercato, preinstalled and running in dev mode. Entities, modules, generators and hot reload included.

Business essentials

Encryption, role-based access (RBAC), multi-tenancy, audit logs, search and queues.

Editor & terminal

VS Code in the browser, a bridge to your desktop editor, and a web terminal with full TUI and TMUX support.

Coding agents

Codex, Claude Code and OpenCode, preinstalled and authenticated. Other CLI agents are supported too.

Sharing & GitHub

Changes appear instantly in a live preview with optional password protection. GitHub is connected for cloning, commits, pushes, pull requests and CI workflows.

Export & import

Download your source (.tar.gz) and database (.sql), or move the project to another sandbox.

Infrastructure

8–16 GB RAM, 2–4 vCPUs and NVMe SSDs. Resources vary by configuration.

Monitoring, scaling and certificates are managed. Daily backups on Enterprise.

Say it. Shape it.

Pick an idea. Watch the agent work and the sandbox change.

Current taskWorking

Give every bundle 15% off.

Changes stay in their own branch

Open MercatoSales

Bundle pricing

A little more, for a little less.

Studio bundle

Notebook + cup + tray

$80.00

Bundle price

Your everyday essentials.

Meet Cezar

Your AI coding agent, included.

Start tasks from your phone. Cezar coordinates your coding agents and works in the background, 24/7 on Enterprise. Review the results when you're ready.

  • I'll keep the queue moving.

    Your GitHub issues become tasks with their own branches. When an agent needs your answer, its slot opens up for the next task.

  • Claude can build. Codex can review.

    Save the steps and checks as a workflow, or run two versions and compare the changes.

  • You decide what gets merged.

    Read the diff, ask for revisions, or open a draft PR.

See Cezar on GitHub

Open source. MIT licensed. Runs locally or on your server.

Pricing

Choose a plan for your project.

Developer

For your next experiment.

$45first month

+ $25 AI Credits Starter, paid once.

then $95 / mo; additional AI Credits billed separately

Excl. tax

  • 1 sandbox · 1 seat
  • Live preview & sharing
  • Sleeps after 1 hour idle

Enterprise

For work that needs to stay live.

$1,400per month

  • 1 sandbox · 3 seats
  • Always on · custom domain
  • Enterprise licence & daily backups

Enterprise Custom

For larger teams and your own infrastructure.

Custom

Priced around your team

  • More seats & sandboxes
  • Dedicated or on-premise hosting
  • Tailored licence & support

Enterprise Custom

Let's talk about your setup.

Leave your details. We'll work out the right sandbox with you.

Create an account to get started. For a custom setup, talk to our team.

Plan details & AI billing

Developer

  • 1 sandbox, 1 seat
  • Sleeps after an hour idle, wakes on your next visit
  • Password protected and public preview sharing
  • MIT licensed modules
  • Export and import your sandbox

Enterprise

  • Full Open Mercato Enterprise licence
  • 1 sandbox, 3 seats
  • Runs 24/7, no idle sleep
  • Production hosting with a custom domain
  • Enterprise modules and Customer Success
  • Daily backups, kept for 7 days

Enterprise Custom

  • Sandbox count and seats sized to the team
  • Dedicated or on premise infrastructure
  • Scoped licence and support terms

Keep your AI subscription. Skip the token markup.

The $25 AI Credits Starter is a one-time purchase, billed separately from your workspace plan. For further AI usage, use your own Claude or Codex subscription or top up at OpenRouter prices with no markup. Top-ups carry over; there is no recurring credit allowance.

Discount codes apply for partners, contributors and Brave users.

Before you jump in

Sign up, choose a template and create your sandbox. Already have an account? Sign in to return to your workspace.

Your next feature starts here.

Create your account and start building in your browser.

Request access