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We built an open-source AI web testing tool where most tests never even call the AI
My partner and I built Catcher — a desktop app for AI-powered web testing.
You describe tests in English:
Click the 'Sign in' button
Type 'alice@example.com' in the email field
Verify the page contains 'Welcome, Alice'
Hit run, and it executes them in a real browser on your machine.
A few things that make it different from other AI testing tools:
- Most steps don't call the LLM at all — Catcher does a heuristic match on the live DOM first, and only falls back to the AI when it's not confident
- Everything runs locally. No cloud, no account, no telemetry
- You bring your own API key — OpenAI, Anthropic, Gemini, Ollama, or any OpenAI-compatible endpoint
- When all click strategies fail, it screenshots the page and asks the model for pixel coordinates as a last resort
It's MIT licensed and still early (v0.1.1). We'd love feedback.
u/Bitter_Sock7422 — 2 days ago