Browser extension
Contrast Audit Overlay
Outline every text element on a page that fails WCAG AA or AAA contrast, and export the table as CSV.
One click on any page: each piece of text is measured against the background it actually sits on, failures are outlined with their ratio, and the whole table can be exported. Works on staging and localhost pages because nothing leaves your browser.
Privacy: runs entirely in your browser, on the active tab, only when you click. No account, no network requests, no data collected.
Get it for Firefox Not on the Chrome Web Store yet
The Firefox version is live on addons.mozilla.org. A Chrome Web Store listing is planned but not published; this page will link it when it exists.