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Coblis vs Sim Daltonism: catalog facts
Coblis	Sim Daltonism
Free Free to use in the browser.	Free Open source; the page does not list a price.
Web	macOS, iOS
Images are processed locally and never uploaded No limit on image size	Live filtering of any screen area on the Mac Camera-based simulation on iOS
Works on images only, not live web pages Lens feature has known issues in Edge and Internet Explorer	Apple platforms only Licence is not stated in the research
Web application	Downloadable app
Closed source	Open source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	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.