Leonardo Color
Build colour scales around target contrast ratios for an interface or design system.
What’s included for free?
Free open-source web application and colour-generation library. Share palette parameters by URL; implementation and accessibility testing remain your responsibility.
Where it runs: Browser
Provider information ↗Checked 2026-10-08
Before you use it
Apache-2.0 software; retain required notices. Generated palettes alone do not establish full website accessibility.
Provider terms can change. Check current pricing and usage rights before starting a project.