Accessibility & Contrast Checker
A free Chrome extension. One click runs axe-core's WCAG A and AA rules on the page you are looking at and shows you every problem it finds, with the element, the reason and a link to how to fix it.
It collects nothing and makes no network requests. There is no account and no payment.
Automated checks cannot find every accessibility problem. This tool is for finding the ones they can, quickly — not for certifying a page.