Short answer: no. An accessibility overlay does not make a website lawsuit-proof, and some businesses using overlays have still been sued. Here is what overlays do, what they don't, and how to lower real risk.
There is no single 'best' accessibility tool — the right choice depends on your stack, budget, and risk profile. Here is an honest framework for choosing, and where automation fits.
WCAG 2.2 AA is the mid-level conformance tier of the Web Content Accessibility Guidelines 2.2 — the international standard most digital accessibility laws reference. Here is what it means in plain English.
Runtime automation patches a meaningful slice of the technical web-content criteria in WCAG 2.2 AA. It is a strong baseline — not a legal certification. Here is an honest look at where it helps and where you still need people.
WCAG 2.2 AA is a superset of the web-content technical requirements referenced by the ADA, Section 508, the EAA, AODA, and ACA. Measuring against it gives you one strong baseline that maps to several laws.