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gencolormap vs ColorBrewer: catalog facts
gencolormap	ColorBrewer
Best for: Researchers choosing color maps for data visualization	Best for: Cartographers and data analysts choosing colors for maps and charts
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	Filters for colorblind safe, print and photocopy safe schemes Map preview with context layers All 3 strengths for ColorBrewer Filters for colorblind safe, print and photocopy safe schemes Map preview with context layers Exports to ASE, GIMP palette, JavaScript and CSS
The GUI requires Qt	Limited to its curated set of schemes Interface is aimed at cartography rather than general design
Downloadable app, Web application	Web application
Open source	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 ColorBrewer colorbrewer2.org Catalog checked September 23, 2026

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