Media & visuals
Bar graphs & data visualizations, images, logos, carousels, background video, background GIFs, embedded video
Thanos Core 3.5
Thanos Web Accessibility AI Agent
We have trained Thanos to understand the general notion that there needs to be a balance between design and web accessibility. Not all errors are equal, and we know the difference. There are clear differences between usability issues and genuine violations of the Web Content Accessibility Guidelines (WCAG). We know how to distinguish the two, and that distinction matters: it keeps the AI Agent focused on making relevant web accessibility fixes that have an impact, instead of chasing cosmetic noise.
Why it matters
About one person in six worldwide (an estimated 1.3 billion people) experiences significant disability (WHO). Those are customers, employees, & investors. When your site isn't accessible, you're turning them away at the door, & most will never tell you why they left.
The legal exposure is real & growing. Plaintiffs have filed more than 4,000 digital accessibility lawsuits every year since 2021, 4,187 in 2024 alone (UsableNet), & the European Accessibility Act began enforcement in June 2025 for businesses serving EU customers. Accessibility is no longer a nice-to-have; it's a compliance line item.
There's an upside, too. The same work that removes barriers (clear structure, readable text, working keyboard navigation) makes your site easier for everyone to use, easier for search engines to understand, & harder for competitors to beat. An accessible website doesn't just avoid lawsuits. It wins customers.
Web accessibility AI Agent workflow
- AI Agent
- Playwright
- axe-core
- WAVE
- WCAG rules
- AI interprets findings
- AI prepares website fixes
- Human approval
- Re-tests
How it works
The AI Agent audits your pages against WCAG 2.2 AA, checking things like alt text, keyboard navigation, color contrast, and focus indicators. It separates genuine accessibility barriers from minor usability quirks, then drafts fixes for the real barriers. Every fix waits for a human's approval before it reaches your visitors.
Audit checklist
Twenty-six elements. Zero hiding places.
The AI Agent checks every element type on your page against WCAG 2.0, 2.1, and 2.2, Levels A and AA. The checklist grows with the standards: when WCAG 2.3 is published, its criteria slot into the same framework.
Player controls
Play, pause, volume, closed captions, audio description
Links & navigation
Links, anchor links, email links, link distinguishability, social media links, click-to-call links, menu bar, hamburger menu
Forms & inputs
Radio buttons, text input fields, accordions
Documents & text
PDFs, Word documents, trademark & copyright symbols
FOR Paid clients only
Human-in-the-loop, always
Automated scans catch a lot, but some barriers only a human can judge. For every paid ThanosLab client, a human reviewer personally checks the elements below on every audit. This is how we go beyond automated scans, and it is included only with paid ThanosLab plans.
Keyboard navigation
Tab through every page end to end, confirm a visible focus indicator, no keyboard traps, & a logical tab order
Video & audio
Verify closed captions are present & accurate, & that audio descriptions exist where the visuals carry meaning
Documents
Manually check PDFs & Word documents for tags, reading order, & screen reader compatibility
Screen reader review
Listen to key flows with a real screen reader to confirm headings, landmarks, & announcements make sense
Alt text quality
Judge whether alt text actually describes the image, not just whether the attribute exists
Real task completion
Complete core tasks like forms, checkout, & booking using only assistive technology, the way your visitors would
From findings to managed remediation
Accessibility AI doesn't stop at finding problems. It turns findings into managed remediation work: detect barriers, group root causes, propose fixes, route them for approval, retest changes, preserve evidence, & monitor for regressions.
Every audit runs against WCAG 2.2 AA, the current standard. If you want to see how the versions compare before you commit to one, read the differences between WCAG 2.1, 2.2, and 3.0.
SMBs get a site that works for everyone; agencies get WCAG coverage across every client.
How Halo comparesSee what Halo checks automatically that axe, WAVE, Lighthouse and other scanners leave to a person, with sources.Read moreWhy our agents find more1,229 unique checks, six screen widths per scan, and false alarms filtered out before a report reaches you.Read moreBuilt for agencies
Run the four AI scanners and client ready reports under your own brand.
Free Scan available on the Web Accessibility AI Scanner.
Run your free scanFrequently asked questions
Straight answers about how the accessibility audit works & where humans stay in the loop.
It audits your pages against WCAG 2.2 AA, checking every element type on your page against WCAG 2.0, 2.1, & 2.2 at Levels A & AA: a 26 point checklist spanning media & visuals, player controls, links & navigation, forms & inputs, & documents & text, using automated engines & browser based testing.
A WCAG violation means a page fails a specific success criterion in the standard, such as missing alt text or a keyboard trap. A usability issue makes a page harder to use without breaking a criterion. The AI Agent separates the two, so genuine barriers get fixed first & cosmetic noise does not crowd out the work that matters.
No. Automated engines catch a large share of barriers, but some only show up through human judgment & assistive technology testing. That is why every criterion in an audit carries an honest status: pass, fail, needs review, not applicable, or not tested. Needs review & not tested are never counted as passes.
No. The AI Agent drafts fixes for the barriers it confirms, & every fix waits for human approval before it reaches your visitors. After approval, the change is retested & the evidence stays on record.
For paid clients, a human reviewer checks the things automation judges poorly: keyboard navigation end to end, caption accuracy, PDF reading order, alt text quality, & completing real tasks like forms & checkout using only assistive technology.
Run the free scan on the Web Accessibility AI Scanner. It scores your site & shows the barriers it finds, so you can see the starting point before any remediation work begins.