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

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