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gencolormap vs Chroma.js Color Palette Helper: catalog facts
gencolormap	Chroma.js Color Palette Helper
Best for: Researchers choosing color maps for data visualization	Best for: Building readable color scales for charts and maps
Free Free software under the MIT License.	Free Free to use in the browser.
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	Focuses on perceptually balanced color steps Checks palettes for colorblind safety All 3 strengths for Chroma.js Color Palette Helper Focuses on perceptually balanced color steps Checks palettes for colorblind safety Aimed at charts and maps
The GUI requires Qt	Specialised for data visualization rather than UI themes Plain interface with little guidance
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	Not stated if it works offline
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 Chroma.js Color Palette Helper gka.github.io/palettes Catalog checked September 23, 2026

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