The TPG Mobile Accessibility Testing for Android and iOS (PDF, 2.6MB) is a free accessible PDF outlining how to test native apps and the web for accessibility on Android and iOS. It provides an overview of accessibility settings, how to use them and common testing tools.
Source: developer.paciellogroup.com
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available. As an alternative you can also try our non-DTD-based validator.
Source: validator.w3.org
Lighthouse is an open-source, automated tool for improving the quality of web pages. You can run it against any web page, public or requiring authentication. It has audits for performance, accessibility, progressive web apps, and more.
Source: developers.google.com
Axe is an open source rules library for accessibility testing. It was developed to empower developers to take automated accessibility testing into their own hands and to avoid common pitfalls of other automated accessibility tools.
Source: deque.com
