Accessible color palette builder
Create a color palette and test it for accessibility.
Colors
90 accessible color combinations
Contrast Ratio
Calculates the contrast ratio between two colors
Tanaguru Contrast Finder
Given two colors, this tool helps you to identify the colors between that still have accessible contrast.
Colorblind Web Page Filter
Will fetch any public URL and display the site as seen by people with different types of color blindness.
Color Oracle
Free downloadable software that helps simulate color blindness
Randoma11y
A fun random accessible color scheme generator.
How to keep your CSS grid layouts accessible
This tutorial by Anna Monus warns about some potential accessibility issues with CSS grids and outlines how to make your grid layouts accessible.
Under-Engineered Toggles
A tutorial by Adrian Roselli that walks you through coding up designed toggles that work as well as plain old checkboxes (because they are plain old checkboxes)
Firefox Accessibility Inspector
Included with Firefox since version 63, this tool gives developers easy access to the information exposed to assistive technologies, allowing you to check what’s missing or needs attention.