Accessible Text Color Picker
Decide whether black or white text is more readable on any background color.
Related
Accessible Contrast Fixer
Adjust a foreground color's lightness until it meets a WCAG contrast target.
Color
Alpha Blend Over Background
Compute the solid opaque color produced by a translucent color over a background.
Color
Analogous Color Scheme Generator
Create harmonious neighboring-hue palettes around a base color.
Color
ANSI 256-Color to RGB
Map xterm 256-color palette indices to RGB hex and back to the nearest index.
Color