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

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