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HTML Color Codes vs Pastel: catalog facts
HTML Color Codes	Pastel
Free Free to use in the browser; no paid tier is mentioned on the page.	Free The open-source application is available without a license fee.
Web	Windows, macOS, Linux
Converts between Hex, RGB, HSL and OKLCH Extracts colors from uploaded images	Multiple color formats and composable commands
Reference-style site rather than a full palette workspace Developer is not named on the page	A terminal workflow rather than a graphical design editor.
Web application	Downloadable app
Closed source	Open source
License not stated	License not stated
No account needed	Not stated if an account is 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 22, 2026

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