xsbl is an AI-powered web accessibility scanner that checks your website against WCAG 2.2 AA and AAA criteria. It scans your rendered pages in a real browser, identifies violations like missing alt text, contrast failures, broken ARIA, and keyboard traps, and generates specific code fix suggestions for your actual markup.

How is xsbl different from accessibility overlays?

Unlike overlays that inject JavaScript and only detect about 30% of WCAG issues, xsbl scans your actual rendered DOM in a real Chromium browser. It provides real code fixes instead of cosmetic patches, works with screen readers rather than against them, and produces exportable compliance evidence accepted by courts and auditors.

Does xsbl support WCAG 2.2?

Yes. xsbl covers 90+ rules across WCAG 2.2 AA and AAA criteria, including contrast, alt text, ARIA, keyboard navigation, forms, headings, landmarks, and more. Each issue is mapped to the specific WCAG success criterion it violates.

Can xsbl create GitHub pull requests with accessibility fixes?

Yes. Connect your GitHub repository and xsbl can generate pull requests with AI-suggested code fixes for accessibility issues. You can fix individual issues or use bulk fix to address multiple issues in a single PR.

How much does xsbl cost?

xsbl offers a free tier with 1 site and 3 scans per month. Paid plans start at $19/month for Starter, $69/month for Pro with unlimited sites and 100 scans, and $249/month for Agency with white-label reports, VPAT generation, and dedicated support.

All WCAG criteria

Perceivable1.4 DistinguishableLevel AAWCAG 2.1

1.4.11: Non-text Contrast

UI components and graphical objects have a contrast ratio of at least 3:1 against adjacent colors.

Why this matters

Form fields, buttons, icons, and charts need sufficient contrast to be perceivable. A checkbox border that blends into the background is invisible to users with low vision.

Common failures

These are the most frequent ways this criterion is violated in real-world websites:

Input borders with insufficient contrast against the background
Icon-only buttons where the icon is low contrast
Chart segments or graph lines that are indistinguishable
Focus indicators that don't meet contrast requirements
Custom checkboxes/radio buttons with faint borders

How to fix

Ensure all interactive element borders have at least 3:1 contrast against their background
Test icons and UI graphics with a contrast checker
Use distinct patterns or labels in addition to color in charts
Make focus indicators clearly visible with sufficient contrast

Related axe-core rules

xsbl uses axe-core to automatically detect violations of this criterion. The following rules are checked:

color-contrast-enhanced

Check your site for 1.4.11 violations

xsbl scans your rendered pages in a real browser and finds violations of this criterion automatically.

Scan your site free

Official reference: Understanding WCAG 1.4.11: Non-text Contrast (W3C)