Free tools
Small tools for people who test things
No account, no email gate, no upload. Everything below runs entirely in your browser and is useful whether or not you ever use ZeusQA.
Viewport size reference
Live CSS viewport, DPR, safe-area insets and pointer type, plus the real viewport of 100+ devices.
Selector brittleness checker
Paste selectors or a whole spec file. Get a score per selector and the reason each one will break.
Test prompt builder
Compose a browser-agent test prompt, an equivalent for any agent, or a manual test plan.
Try it on your own site
Paste a URL, describe the flow in plain English, and watch a real browser do it. Five runs free, no card.