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RIDI vs Millie: catalog facts
RIDI	Millie
Free The viewer apps are free; books, webtoons and web novels are bought from the RIDI store.	Paid Monthly subscription; the second month is currently free after the first paid month.
Windows, macOS, Android, iOS	macOS, Web
Apps for phones, tablets and desktop computers Covers ebooks, webtoons and web novels	Unlimited reading for one subscription E-books, audiobooks, webtoons and web novels in one place
Only reads content from the RIDI store Desktop viewer is still a beta	Korean-language service and catalog Requires a paid subscription
Downloadable app	Downloadable app, Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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