Accessibility overlay vs real WCAG remediation

An overlay is a script added to a website that places a toolbar or widget on each page and claims to adjust the page for disabled visitors automatically. Remediation is the slower work of fixing the page itself — its code, its content and its layout — so that it meets the standard without anything added on top. The pitch for overlays is speed and price. The case against them is written by the regulator.

The Justice Department's position is that the ADA applies to websites of public-facing businesses. Its guidance then adds the warning that matters here: overlays are not a guarantee. Automated tools can help, it says, but a clean automated report does not necessarily mean a page is accessible, and manual checking should be paired with automation.

What each one actually changes

An overlay runs in the visitor's browser after the page has loaded and tries to patch what it finds: guessing alt text, adjusting contrast, relabelling elements. The page underneath is unchanged, so the problems are still there for any tool or visitor that reads the page directly. Remediation changes the page at the source — the HTML, the templates, the content — so the fix exists whether or not a script runs.

The full-page rule

WCAG does not allow partial credit: WCAG conformance is full-page, including every version of the page shown at different screen sizes. An overlay that fixes some issues and misses others has not produced a conforming page, and it cannot certify that it has. Remediation works through the whole page, template by template and breakpoint by breakpoint, because that is the unit the standard measures.

Problems a script cannot solve

Some requirements are about layout and meaning, not attributes. WCAG 2.2 SC 1.4.8 — 200% text resize is one: text must be resizable up to 200 percent without the reader having to scroll sideways to follow a line. That is a property of how the page is built, and no widget bolted on afterwards can redesign a layout that was not built to reflow. Alt text is another. A script can describe what a picture shows; only someone who knows the business can say what the picture is for. A caption on a video, a sensible reading order and a form error that explains what went wrong are all authored, not generated.

Forms, where the money is

The Justice Department lists inaccessible forms — missing labels, instructions and error indicators — among its concrete examples of barriers. Forms are also where a business takes bookings, quotes and payments. Overlays are least reliable exactly there, because fixing a form properly means understanding what each field is for and what the validation rules are. Remediating the handful of forms on a small business site is usually a modest job and delivers the largest practical improvement.

Cost structure

Overlays are sold as a subscription, and the subscription never ends, because the fix never becomes part of the site. Remediation is front-loaded: the work is done once in the templates and then maintained as the site changes. We do not quote a market price for an accessibility audit, because we have not found a primary source for one. On our plans remediation is part of the build — sites run $150 to $400 a month by size — rather than a separate product.

Legal posture

No product can promise legal compliance, and the Justice Department's guidance explicitly declines to set detailed technical standards for private businesses. What a business can show is effort that matches the regulator's own advice: WCAG as the reference, automated tools used carefully, and manual testing to confirm. An overlay alone is not that. For public entities the bar is written down — WCAG 2.1 Level AA, on fixed dates (compliance April 26, 2027 / April 26, 2028) — and an overlay's marketing does not change the standard the page is measured against.

Use automated tools as a first pass, as the Justice Department suggests, and then fix the page itself: templates that reflow, forms with real labels and errors, alt text written by someone who knows what each image is for, and captions on video. That is remediation. A widget on top of an unchanged page is not.