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