For owners, builders, and the curious

Spin up a throwaway Flarum in about a minute.

Test a change before it ever touches your live forum. Build and test extensions in real isolation. Or just try Flarum and see what the buzz is about — every sandbox is a genuine Flarum with AI wired in, and it can’t break anything that matters.

Launch a sandbox See how it works

A real Flarum you can break.

Not a mock and not your production forum — a genuine, disposable Flarum with an AI wired in, ready in about a minute.

Real Flarum, your database

A genuine Flarum install on its own subdomain, not a mock — on your choice of MariaDB, MySQL, PostgreSQL or SQLite, the four engines Flarum supports. Ready in about a minute.

AI installs, configures + tests

A built-in MCP endpoint in write mode with the extension manager: your AI installs and configures extensions, edits content, and runs diagnostics — building against a real forum. (You author the code in your AI coding tool.)

Disposable by design

Minimal footprint, no backups. Break it freely and launch a fresh one — each sandbox tears down automatically after 4 hours.

Free, 4-hour sessions

No cost and no commitment — each sandbox runs for 4 hours, then tears down automatically. Shut it down sooner anytime.

Running in a minute.

Nothing to install locally — just launch and point your AI at the sandbox.

1
Launch
Hit Launch — your sandbox provisions on its own subdomain in about a minute.
2
Connect your AI
Point your MCP client at the sandbox’s /mcp endpoint, shown on your sandbox page.
3
Build & troubleshoot
Install extensions, edit, and diagnose — with AI driving if you like.
4
Shut it down
Shut it down anytime; otherwise it tears down automatically after 4 hours. Launch another whenever you need one.

Free to use.

No cost and no commitment — each sandbox runs for 4 hours, then tears down automatically.

Sandbox

$0 / 4-hour session

Everything below, on every account, at no cost. No credit card required.

Everything included:
Real Flarum on its own subdomain
MCP in write mode + extension manager
Point it at your own extension repo
Your choice of MariaDB, MySQL, PostgreSQL or SQLite
Minimal footprint, no backups
Shut down anytime — auto after 4 hours
Launch a sandbox
No credit card. Free, 4-hour sessions.

Frequently asked questions

Everything you need to know about the developer sandbox.

What is the developer sandbox?
A disposable Flarum instance for building and troubleshooting extensions and themes. It runs on its own subdomain with a built-in AI (MCP) connection, so you can install extensions, edit content and read logs — then throw it away.
Is it a real Flarum?
Yes — a genuine Flarum install on MariaDB (the database the extension ecosystem is built for), not a mock. It’s ready in about a minute on its own subdomain.
How does the AI build against it?
You author the extension in your own AI coding tool (Claude Code, Cursor…); the sandbox is where it gets installed, configured and tested. The built-in MCP (write mode) plus the extension manager let your AI install extensions, edit content and run read-only diagnostics against a real Flarum — and you can wire in your own extension repo as a source.
Can I point it at my own extension?
Yes — point a sandbox at your own extension repo and the AI builds and tests against your code in a clean Flarum, with nothing to set up locally.
What does it cost?
Nothing — sandboxes are free. Each one runs for 4 hours, then tears down automatically. Launch another whenever you need one.
Does it persist?
No — sandboxes are disposable, with a minimal footprint and no backups. Each one runs for 4 hours, then tears down automatically. Break it freely and launch a fresh one anytime.
Do I bring my own AI keys?
Yes. Your AI client uses your own account and keys — the sandbox hosts the forum and the MCP connection, not the AI, so there are no AI usage charges from us.
Still have questions?
Contact us