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Migaku vs Memento: catalog facts
Migaku	Memento
Freemium Can be started without a credit card; paid plans unlock full use.	Free Free and open source under the GPL-2.0 licence.
Browser extension	Windows, macOS, Linux
Learn from content you already watch and read Works across popular streaming and social sites	Popup dictionary over subtitles using Yomitan dictionaries One-step Anki card creation via AnkiConnect
Built as a Chrome extension Proprietary with paid plans	Focused on Japanese only macOS build is for Apple Silicon (arm64)
Browser extension	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0
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 September 24, 2026	Official website Full listing and sources Checked October 1, 2026

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