An AI agent that uses your site like a real user — and reports bugs.
Free & open source (AGPL-3.0) · No credit card
Built for the websites you actually ship
The problem
Your checklist, your staging review, your manual clicks — they test what you expect users to do. Real users don't care about your expectations.
User fills out your form, clicks submit, and gets… nothing. No error. No confirmation. They leave.
Your CTA looks fine in your browser. On mobile, it's invisible, overlapped, or just broken.
A user clicks through three pages and arrives somewhere broken. They don't come back.
Your beautiful desktop design becomes unusable at 390px. You only find out when someone complains.
Most bugs aren't in your code.
They're in how real users actually behave on your site.
That's why every website should be monkey tested.
How it works
No test scripts. Give it a URL and read what broke.
Run the open-source CLI, or open the live demo. No test scripts to write.
Works on production, staging, or any publicly reachable URL.
The agent uses a real browser to click around, fill forms, and try paths a script would miss.
You see the steps it took and the screenshots along the way.
Bugs come back with screenshots and a recording. After a fix, rerun the same plan and diff it.
The CLI writes plan.json and run.json you can keep.
Two ways to use it
The open-source CLI and library are the main path. The free cloud needs no install and no API key if you want to watch a run first.
AGPL-3.0 CLI and library. Install it, bring your own LLM or a local model, and run it from your terminal or CI.
No install, no API key. Sign up and watch it test your site live. Free, with limited usage. There are no paid plans. Run it yourself for unlimited use.
Same engine either way. The free cloud is for watching; the CLI is how you keep using it. It's free — no paid plans.
Open source
The engine is free and open source. Bring your own LLM, or run a local model. The live demo only lets people watch it work.
$ npm install -g @mtai/monkeytest-core
$ monkeytest run https://example.comAGPL-3.0. Free forever. You pay your own LLM provider, or nothing with a local model.
Open an issue or read CONTRIBUTING.
Local models run through Ollama. Any OpenAI-compatible endpoint works too.
Why MonkeyTest
— = requires manual setup or prior configuration
Open source under AGPL-3.0. Run it yourself, or try the free cloud.
Bring your own LLM, or run it locally.