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Color Oracle vs Colorblindly: catalog facts
Color Oracle	Colorblindly
Free Free to download and use.	Free Free to use; the source is published on GitHub.
Windows, macOS, Linux	Browser extension
Simulates common color vision impairments in real time Works over designs in different applications	Simulates color blindness on any live page Lightweight CSS filter approach
Windows and Linux versions require Java 6 or later The project notes that highly saturated colors may not simulate well	Simulation is an approximation of real color vision Small project with occasional updates
Downloadable app	Browser extension
Open source	Closed source
License: MIT	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 October 8, 2026	Official website Full listing and sources Checked October 1, 2026

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