BrowserSnaps — capture any site at every screen size, then find out what's wrong with it.
Full-page screenshots of multiple pages at desktop, laptop, tablet and mobile in one run — export as PDF, PNG or ZIP
~30 SEO and accessibility checks: noindex, missing alt text, broken heading order, images served larger than displayed, duplicate titles across pages
Core Web Vitals and page weight graded on Google's thresholds, plus an optional Lighthouse-formula performance score computed on your own machine
Names the stack behind any page — framework, CMS, analytics, CDN, server — with versions when the page states them
Downloads every image on a page in one click
Nothing leaves your browser: no account, no backend, no analytics, and it asks for zero website permissions
Works on pages behind a login and on localhost, which PageSpeed Insights can't reach
Free and open source (MIT)