Paste a page, or point at a live URL, and see every check the deploy gate runs: pixels as declared, preview URL, tracker integrity, and the tap itself, simulated against the exact tracker code the page carries. Same code as CI, run here.
Nothing leaves your browser in this mode: the tracker runs inside a fake window with no network. Link checks are skipped.
The page is fetched server-side (no CORS), checked with the same code, and PageSpeed Insights is asked for mobile lab and field data.
Every page in pages/*.json at the last site build. Each button fetches the live URL and runs the full check against that page's config.