Color and Contrast.com
Color & Contrast is an interactive guide to color for designers.
Quick tip: Starting a design with accessibility - The A11Y Project
Three quick tips to help us design more accessibly.
Designing for Accessibility: Focus States - DockYard
Designing custom focus states for a design system
Scaling accessibility with a design system.
Geri Reid, UI and UX Designer, London
The Colorblind Designer - The Design Team
And some color tools to design for accessibility
Colorable
19.43:1 contrast ratio
Tackle accessibility in your designs with these useful plugins
Tackle accessibility challenges color contrast and keyboard navigation as part of your design process in Figma with 4 useful plugins.
Designing accessible products – uxdesign.cc
A comprehensive visual guide to making web technology available to a diverse world.