Leonardo is Adobe's open-source, contrast-based color generator: instead of picking a color and checking its contrast afterward, you set a target contrast ratio and Leonardo generates a color that meets it.
It supports adaptive themes where end users can adjust brightness, contrast, and saturation themselves via an npm module, and it evaluates colorblind-safe combinations across every type of color vision deficiency, not merely a generic simulation.
Design system engineers building genuinely contrast-first color systems, especially those wanting an npm package for adaptive, user-adjustable themes rather than a fixed static palette.
Share the tool's URL directly with teammates rather than describing the settings verbally. The URL updates with the current parameters, so a shared link reproduces the exact configuration for review.
Creating, managing, and sharing accessible color systems.
