Testing & Development

Tools for developing and testing accessibility

PEAT Photosensitivity Epilepsy Analysis Tool

by Trace R&D Center, University of Maryland

A free tool for analyzing web content to determine if it might cause seizures in those who have photosensitive seizure disorders such as epilepsy. 

Photosensitive Epilepsy Analysis Tool


The Trace Center's Photosensitive Epilepsy Analysis Tool (PEAT) is a free, downloadable resource for developers to identify seizure risks in their web content and software. The evaluation used by PEAT is based on an analysis engine developed specifically for web and computer applications.

Rocket Validator

Rocket Validator provides web developers with a web spider that can crawl a complex site and check up to 5,000 pages for HTML5 conformance and accessibility.

508 Checker

by Formstack

With you can quickly check a webpage for 508 compliance and learn more about how to become 508 compliant.


by soffes

Color utilities for macOS, iOS, tvOS, and watchOS


by mojoaxel

?️ A curated list of resources around the topic: visual regression testing


by tollwerk

Fractal component library tool ( plugin for accessibility testing against Tenon (


by daisy

Ace by DAISY, an Accessibility Checker for EPUB


by jaimeiniesta

A web service to check Accessibility on your sites using accesslint-cli