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Flat UI Colors vs Happy Hues: catalog facts
Flat UI Colors	Happy Hues
Best for: Picking ready-made flat UI colors quickly	Best for: Curated color palettes shown applied live to an example website UI
Free Free to use in the browser.	Free Free web tool.
Web	Web
280 curated colors in 14 palettes One-click copy of color codes All 3 strengths for Flat UI Colors 280 curated colors in 14 palettes One-click copy of color codes No account needed	Shows palettes in real UI context instead of flat swatches Free to use with no signup
Fixed palettes, no palette generator Limited to the flat design style	Limited to the curated set of palettes provided Web-based only, no downloadable app
Web application	Web application
Not open source	Not open source
License not stated	License not stated
No account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Sources for Flat UI Colors flatuicolors.com Catalog checked September 24, 2026	Official website Full listing and sources Sources for Happy Hues happyhues.co Catalog checked September 22, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.