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WhoCanUse vs Coblis: catalog facts
WhoCanUse	Coblis
Free Free to use; the developer accepts GitHub sponsorships.	Free Free to use in the browser.
Web	Web
Previews each color blindness type and other vision conditions Shows share of people affected by each condition	Images are processed locally and never uploaded No limit on image size
Checks one color pair at a time Does not scan a live web page	Works on images only, not live web pages Lens feature has known issues in Edge and Internet Explorer
Web application	Web application
Closed source	Closed source
License not stated	License not stated
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 September 23, 2026

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