BAAT

BAAT – Bookmarklet Accessibility Audit Tool

BAAT (Bookmarklet Accessibility Audit Tool) is a lightweight tool for quick technical accessibility testing of websites. It is based on the open-source axe-core engine and runs directly in the browser.

BAAT is not a complete audit tool, but is suitable for initial technical quick analyses and identification of common barriers.

Use Cases for BAAT

BAAT is particularly suitable for:

• Initial technical quick checks of websites
• Preparatory tests before manual accessibility evaluations
• Supporting developers in error detection during development
• Supplement to comprehensive manual WCAG or BITV tests

Features of BAAT

• Direct activation in the browser via a bookmarklet
• Automatic detection of common barriers:
  • Missing alternative texts
  • Keyboard navigation issues
  • Unlabeled form elements
  • Missing or incorrect ARIA roles
• Visualization of errors on the webpage
• Export function: Results can be saved as a JSON file

Advantages of BAAT

• Quick use without installation
• Easy entry point for technical evaluations
• Based on axe-core: Reliable technical analysis
• Ideal for early-phase testing and technical QA

Limitations of BAAT

• No comprehensive manual accessibility evaluation
• No assessment of understandability, usability, or content structure
• Does not replace complete WCAG or BITV audits

Using BAAT

• Download the bookmarklet: BAAT Bookmarklet on GitHub
• Alternative access: BAAT Bookmarklet direct link via mscr.it
• Drag it to your browser’s bookmark bar
• Open a webpage and click the bookmarklet to start the evaluation

Integration with Other Tools

For more comprehensive accessibility evaluations, a combined use of the following is recommended:

• BAAT (technical quick tests)
• WAVE, MS Accessibility Insights, or similar tools (further checks and manual audits)
• gooda11y (project management and documentation of accessibility progress)