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Language Reactor vs Memento: catalog facts
Language Reactor	Memento
Freemium Free to use, with additional features in a paid tier.	Free Free and open source under the GPL-2.0 licence.
Browser extension	Windows, macOS, Linux
Dual subtitles on Netflix and YouTube Uses real native material instead of textbook content	Popup dictionary over subtitles using Yomitan dictionaries One-step Anki card creation via AnkiConnect
Depends on third-party streaming sites that can change their players Proprietary	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
Needs internet	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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