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iWantHue vs gencolormap: catalog facts
iWantHue	gencolormap
Best for: Data scientists choosing colors for charts with many categories	Best for: Researchers choosing color maps for data visualization
Free Free to use, with source code on GitHub.	Free Free software under the MIT License.
Web	Linux, Web, Command line
Produces perceptually distinct colors Colorblind-friendly option All 4 strengths for iWantHue Produces perceptually distinct colors Colorblind-friendly option Exports to JSON, CSS and JavaScript in several color spaces Can correct or complete an existing palette	Creates sequential, diverging, and qualitative maps Includes a GUI and scripting-oriented command-line tool All 3 strengths for gencolormap Creates sequential, diverging, and qualitative maps Includes a GUI and scripting-oriented command-line tool Offers a web demo
Aimed at categorical data colors, not brand or UI palettes Colorblind optimisation is slow	The GUI requires Qt
Web application	Downloadable app, Web application
Not open source	Open source
License not stated	License: MIT
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 iWantHue medialab.github.io/iwanthue Catalog checked September 24, 2026	Official website Full listing and sources Sources for gencolormap marlam.de/gencolormap Catalog checked October 8, 2026

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