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Coblis vs Colorblindly: catalog facts
Coblis	Colorblindly
Free Free to use in the browser.	Free Free to use; the source is published on GitHub.
Web	Browser extension
Images are processed locally and never uploaded No limit on image size	Simulates color blindness on any live page Lightweight CSS filter approach
Works on images only, not live web pages Lens feature has known issues in Edge and Internet Explorer	Simulation is an approximation of real color vision Small project with occasional updates
Web application	Browser extension
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	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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