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Viz Palette vs Chroma.js Color Palette Helper: catalog facts
Viz Palette	Chroma.js Color Palette Helper
Free Free to use in the browser.	Free Free to use in the browser.
Web	Web
Simulates several color vision deficiencies Flags colors that are hard to distinguish at different sizes	Focuses on perceptually balanced color steps Checks palettes for colorblind safety
Focused on data visualization palettes only Does not generate palettes itself; links to other tools for that	Specialised for data visualization rather than UI themes Plain interface with little guidance
Web application	Web application
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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