The Promise and Pitfalls of Web Accessibility Overlays for Blind and Low Vision Users
Tlamelo Makati, Garreth W. Tigwell, Kristen Shinohara · 2024 · Proceedings of the 26th International ACM SIGACCESS Conference on Computers and Accessibility (ASSETS 2024) · doi:10.1145/3663548.3675650
Summary
This study provides the first substantial empirical evidence from blind and low-vision users about their experiences with web accessibility overlays—third-party JavaScript tools that claim to enhance website usability for people with disabilities by adding an additional accessibility layer on top of existing content without modifying the underlying code. The researchers conducted an online survey with 47 blind and low-vision respondents and follow-up semi-structured interviews with 12 of them. The most commonly encountered overlays were accessiBe (55.32%), AudioEye (44.81%), UserWay (36.16%), and EqualWeb (10.64%). Participants used a variety of assistive technologies including screen readers (JAWS, NVDA, VoiceOver), braille devices, magnification tools, and services like Be My Eyes. The study was motivated by growing industry adoption of overlays despite significant criticism from over 600 accessibility experts who signed the Overlay Fact Sheet arguing these tools do not adequately serve disabled users. While overlays are marketed as compliance solutions to businesses worried about ADA and Section 508 lawsuits, there has been little research examining whether they actually improve the experience for the end users they claim to help. The study recruited through disability organisations including the National Federation of the Blind rather than social media, to ensure authentic responses from the target community.
Key findings
The results paint a damning picture of overlay effectiveness for blind users. Only 3 of 34 respondents who had used overlay features rated them "very effective," while 16 rated them "not at all effective" and 8 rated them "not very effective." A striking 42.55% of respondents (20 people) reported abandoning or reducing visits to websites specifically because of overlays. Statistically, a Wilcoxon Signed-Rank test confirmed a significant decrease in website visit frequency after overlays were added (Z=1.9, p=.028, r=.6). The most reported accessibility issues on overlay-equipped sites were: incorrect reading or focus order (63.83%), unlabelled or incorrectly labelled fields (61.70%), overlay screen reader conflicting with personal screen reader (51.06%), missing or broken links (48.94%), and lack of keyboard accessibility (48.94%). Interview participants were particularly frustrated that overlays' built-in screen reader modes conflicted with their existing assistive technology—creating multiple competing voices, overriding hotkeys, and interrupting navigation. Participants recognised they were not the overlays' actual customers: "We're not the customer. The disabled person is absolutely not the customer... they're in the business of selling fear of lawsuits." Several noted that the presence of an overlay signalled the underlying website was likely inaccessible.
Relevance
This research provides critical empirical ammunition for accessibility practitioners arguing against overlay adoption. The finding that overlays actively drive away blind users—with nearly half abandoning websites because of them—directly contradicts overlay companies' marketing claims. For organisations considering overlays, this study demonstrates that these tools not only fail to solve accessibility problems but create new ones, particularly for the screen reader users they claim to help most. The participant insight that overlays provide a "false sense of compliance" to businesses is particularly important for policy discussions; the 2024 DOJ update to ADA web accessibility rules notably acknowledged concerns about overlays without endorsing them. Practitioners should use this evidence to advocate for building accessibility into the development process from the start rather than retroactively applying overlay patches. A limitation is the tech-savvy nature of interview participants, who may have stronger opinions than typical users; future work should examine overlay experiences across other disability groups.
Tags: web accessibility · accessibility overlays · screen readers · blind users · low vision · assistive technology · WCAG
Standards referenced: WCAG 2.1 · Section 508 · ADA