Automated Testing
There are many proprietary and open source tools available to audit accessibility using automated testing. Below we have collated our top picks for open source tools, however many publishers may have budget to purchase a tool to do this, therefore, we have included links to other curated lists of accessibility tools from recommended sources. It's important to note that automated testing is only part of the process and can only take you so far, as many accessibility features require human assessment, for example, automated tools can check for the presence of ALT text, but can only guess at it's quality, for example length or matching the file name, and full quality checking will always need a human.
EPubsEPUBs
Ace by Daisy: https://daisy.org/activities/software/ace/
Smart by Daisy: https://smart.daisy.org/
PDFs
PAC (Pdf Accessibility Checker): https://pac.pdf-accessibility.org/en
HTML and Web Pages
Wave Browser extensions https://wave.webaim.org/extension/
Accessibility Checker: https://accessibilitychecker.org/
Curated Lists of Tools
https://www.w3.org/WAI/test-evaluate/tools/list/
https://accessibility-manual.dwp.gov.uk/tools-and-resources
https://github.com/ediblecode/accessibility-resources?tab=readme-ov-file#checkers