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Chroma.js Color Palette Helper vs gencolormap: catalog facts
Chroma.js Color Palette Helper	gencolormap
Free Free to use in the browser.	Free Free software under the MIT License.
Web	Linux, Web, Command line
Focuses on perceptually balanced color steps Checks palettes for colorblind safety	Creates sequential, diverging, and qualitative maps Includes a GUI and scripting-oriented command-line tool
Specialised for data visualization rather than UI themes Plain interface with little guidance	The GUI requires Qt
Web application	Downloadable app, Web application
Closed source	Open source
License not stated	License: MIT
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.