Subtitles that follow along
The sidebar scrolls with the video in real time and highlights the current line — works even on auto-generated captions.
Watch videos,
learn a language naturally
Subtitles follow the video as it plays — kanji get furigana readings, words are color-coded by part of speech, with Chinese translation alongside. Can't parse a full sentence? Let AI break down the grammar.
Core features
Everything you need while watching, right next to the video.
Understand every line
Furigana on every kanji
Real reading practice, not romaji — that's how you actually learn to read. One tap to toggle.
Color-coded parts of speech
Verbs, nouns, adjectives — a different color for each, so sentence structure is clear at a glance.
Chinese translation, side by side
Toggle a Chinese translation under every line — always free.
Learn every line
Hover to look up any word
100,000+ entries from a community-built Japanese–Chinese dictionary (based on Chinese Wiktionary) — fully offline, zero latency.
AI grammar breakdown
Select a sentence and let AI walk through it: full translation, grammar points, word-by-word notes.
Loop and repeat any line
Jump to any line, then loop it to practice pronunciation and intonation.
How it works
Watching is learning.
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1
Install mimikatsu
Free from the Chrome Web Store.
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2
Open any Japanese YouTube video
Works even on videos with only auto-generated captions.
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3
The sidebar opens automatically
Subtitles, furigana, and translation follow the playback position.
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4
Save words, loop lines
Save anything worth remembering, and loop a line to practice out loud.
Start free, upgrade anytime
Core features stay free forever; upgrade to Pro for unlimited saving and AI breakdowns.
Free
¥0 forever
- Subtitles that follow along (even auto-generated ones)
- Furigana on every kanji, one tap to toggle
- Color-coded parts of speech
- Chinese translation, side by side
- Hover to look up any word (100,000+ offline entries)
- AI grammar breakdown (3 per day)
- Loop and repeat any line
mimikatsu Pro
¥198 CNY / year ¥298
Early-bird price, ~¥16.5/mo | or ¥39 CNY/month
- Everything in Free
- Unlimited word and sentence saving
- Export saved items locally
- Unlimited AI grammar breakdowns
- Loop custom segments, or multiple lines together
Early-bird pricing may end at any time; sign-in and payment happen on this site.