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

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