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Coblis vs WhoCanUse: catalog facts
Coblis	WhoCanUse
Free Free to use in the browser.	Free Free to use; the developer accepts GitHub sponsorships.
Web	Web
Images are processed locally and never uploaded No limit on image size	Previews each color blindness type and other vision conditions Shows share of people affected by each condition
Works on images only, not live web pages Lens feature has known issues in Edge and Internet Explorer	Checks one color pair at a time Does not scan a live web page
Web application	Web application
Closed source	Closed source
License not stated	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 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.