A free online ADA and WCAG compliance checker.
Best Tools For Accessibility
Browse 23 + Accessibility Tools
Jumpstart Your Web Accessibility Efforts Directly in Google Chrome

Contrast GridFree
Check compliance with WCAG 2.0 minimum contrast
ACheckerFree
An open-source web accessibility checker

TalonFree
Test for accessibility for people who have limited or no use of their hands
Static AST checker for a11y rules on JSX elements.
Accessibility Checker for Developers, Testers, and Designers in Chrome
Accessibility Insights for Web helps developers quickly find and fix accessibility issues.
Great tool for checking color contrast for both text and images of text.

contrast ratioFree
A tool to calculate the contrast ratio between any two valid CSS colors.
Creates easy to read HTML file from axe-core accessibility results object

Axe CoreFree
Accessibility engine for automated Web UI testing