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Mirumoji vs Language Reactor: catalog facts
Mirumoji	Language Reactor
Free Free and open source under the MIT licence.	Freemium Free to use, with additional features in a paid tier.
Web, Self-hosted	Browser extension
Clickable word lookups in subtitles Whisper-based subtitle generation	Dual subtitles on Netflix and YouTube Uses real native material instead of textbook content
Only for learning Japanese Requires Docker setup	Depends on third-party streaming sites that can change their players Proprietary
Self-hosted	Browser extension
Open source	Closed source
License: MIT	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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