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HSLuv vs HCL Wizard: catalog facts
HSLuv	HCL Wizard
Best for: Developers and designers who generate colors programmatically and want even lightness	Best for: Researchers choosing color palettes for plots and figures
Free The online picker is free to use.	Free Used directly in the browser; no pricing is mentioned.
Web	Web
Perceptually uniform alternative to HSL Saturation expressed as a simple percentage All 3 strengths for HSLuv Perceptually uniform alternative to HSL Saturation expressed as a simple percentage Interactive picker shows the color space directly	Perception-based HCL color space Color vision deficiency emulator for checking figures All 3 strengths for HCL Wizard Perception-based HCL color space Color vision deficiency emulator for checking figures Matches the colorspace packages for R and Python
Mainly a color space definition, so the web picker is fairly minimal Explaining CIELUV assumes some interest in color theory	Aimed at data visualization more than general design Assumes some familiarity with color space concepts
Web application	Web application
Not open source	Not open source
License not stated	License not stated
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Sources for HSLuv hsluv.org Catalog checked October 2, 2026	Official website Full listing and sources Sources for HCL Wizard hclwizard.org Catalog checked September 24, 2026

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