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gencolormap vs iWantHue: catalog facts
gencolormap	iWantHue
Best for: Researchers choosing color maps for data visualization	Best for: Data scientists choosing colors for charts with many categories
Free Free software under the MIT License.	Free Free to use, with source code on GitHub.
Linux, Web, Command line	Web
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	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
The GUI requires Qt	Aimed at categorical data colors, not brand or UI palettes Colorblind optimisation is slow
Downloadable app, Web application	Web application
Open source	Not open source
License: MIT	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 gencolormap marlam.de/gencolormap Catalog checked October 8, 2026	Official website Full listing and sources Sources for iWantHue medialab.github.io/iwanthue Catalog checked September 24, 2026

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