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Memento vs Migaku: catalog facts
Memento	Migaku
Free Free and open source under the GPL-2.0 licence.	Freemium Can be started without a credit card; paid plans unlock full use.
Windows, macOS, Linux	Browser extension
Popup dictionary over subtitles using Yomitan dictionaries One-step Anki card creation via AnkiConnect	Learn from content you already watch and read Works across popular streaming and social sites
Focused on Japanese only macOS build is for Apple Silicon (arm64)	Built as a Chrome extension Proprietary with paid plans
Downloadable app	Browser extension
Open source	Closed source
License: GPL-2.0	License not stated
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 September 24, 2026

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