Contrast - A macOS app for quick access to WCAG color contrast ratios
Hues - The most lightweight color picker for Mac ever
Color Safe - Find accessible color palettes based on WCAG Guidelines
ColorSnapper - The missing color picker for Mac.
Contrast for Figma - Check color contrast against images, gradients, and solids.
Data Color Picker - Create visually-equidistant palettes for data visualizations