Koa11y is a desktop app that allows you to automatically detect accessibility (a11y) issues on webpages. View sample report generated by Koa11y. Koa11y is free and completely open source.
System Requirements:
130-170MB of available disk space (depending on OS)
120MB-200MB of available memory (depending on OS)
Windows XP, Vista, 7, 8, and 10.
OSX 10.6 and above (64-Bit only).
Ubuntu 12+. Zorin 9+. Debian 8+. Other Linux versions, especially Debian based, may work but are not officially supported.