Language Reactor
A browser tool for dual subtitles on video. Useful if you already watch. Not a beginner syllabus.
IntermediateFreemiumModerateListeningBrowser
Good fit if
- Learners who already watch Japanese video
- People who want dual subtitles
- Intermediate students mining lines
Look elsewhere if
- You do not watch Japanese shows
- A podcast already covers ear time
- Setup will eat the week
Language Reactor is a browser extension that adds dual subtitles and lookup to YouTube and Netflix.
Who it fits
It fits learners who already watch Japanese video and want the line in front of them.
Limits
It is not a course. Nihongo con Teppei is a simpler daily listen if you do not watch shows.
Sources checked
Product details can change. These first-party pages were checked Aug 14, 2026.