Accessibility Overlays: Do They Make a Website Accessible?

What is an accessibility overlay?

An overlay is a script a site owner adds with one line of code. It usually shows a floating accessibility button that opens a toolbar with options such as larger text, contrast modes or a reading guide, and some products also try to repair code automatically, for example by guessing alt text or adding ARIA attributes after the page loads.

Overlays are often marketed as a fast, cheap route to WCAG, ADA or European compliance. The problem is that the barriers disabled people face are in the site's own markup, content and behaviour, and a layer added on top cannot reliably fix them.

Why can't an overlay make a website compliant?

Many WCAG requirements need human judgment about meaning and behaviour, which software applied after the fact cannot supply:

• Alt text must describe what an image means in context; an automatic guess is often wrong or unhelpful.
• Form labels, error messages and instructions must be accurate for each field and task.
• Keyboard access depends on how custom controls were built; a script cannot always make them operable in a sensible order.
• Headings and structure must reflect the content's real organisation.
• Video needs accurate captions and audio description, written or checked by people.
• Display options in a toolbar duplicate settings disabled people already have in their browsers and devices.

What have regulators and disability organisations said?

In January 2025 the US Federal Trade Commission announced an order requiring the overlay vendor accessiBe to pay $1 million to settle allegations that it misrepresented the ability of its AI-powered tool to make any website compliant with WCAG. The FTC said overstating a product's AI or other capabilities without adequate evidence is deceptive.

In May 2023 the European Disability Forum and the International Association of Accessibility Professionals issued a joint statement that overlays do not make a website accessible or compliant with European accessibility legislation, are not a substitute for fixing the website itself, and can interfere with users' assistive technology. The Overlay Fact Sheet, signed by a large number of accessibility practitioners, says full compliance cannot be achieved with an overlay.

What should you do instead of using an overlay?

Put the budget into fixing the site:

• Scan your key templates to find the code-level failures; AccessibilityScore.in does this for free for a single page.
• Fix issues in the source code and CMS templates so the fix applies everywhere.
• Test important tasks with a keyboard and a screen reader.
• Train content editors to write alt text, headings, link text and accessible documents.
• Publish an honest accessibility statement with a way to report problems.
• Commission a manual audit before making compliance claims.