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Colorblindly vs Sim Daltonism: catalog facts
Colorblindly	Sim Daltonism
Free Free to use; the source is published on GitHub.	Free Open source; the page does not list a price.
Browser extension	macOS, iOS
Simulates color blindness on any live page Lightweight CSS filter approach	Live filtering of any screen area on the Mac Camera-based simulation on iOS
Simulation is an approximation of real color vision Small project with occasional updates	Apple platforms only Licence is not stated in the research
Browser extension	Downloadable app
Closed source	Open source
License not stated	License not stated
No account needed	Not stated if an account is needed
Works offline	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.