身につく日本語 — Japanese that stays with you

Japanese that stays with you.

Look up a word ー and learn it.

Free to start. No ads. No tracking.

Features

Look up. Save. Remember.

Everything you need to build a Japanese vocabulary that lasts.

Search any word

Search in kanji, kana, or rōmaji. Get the reading, meaning, and an example at a glance.

Save as a flashcard

Add any word in one tap. Review with spaced repetition, built around your pace.

Ready on every device

Your words and progress stay with you across Mac and iPhone.

AI study tools

Create study sessions, check naturalness, and get simple explanations when you need them.

JLPT practice

Practice from N5 to N1 with timed sessions and clear results.

Business Japanese

Keigo, email phrasing, meetings, and interviews. Japanese for work.

Chrome extension

Mitsuki Extension

Save subtitle lines as flashcards while you watch.

Download Soon

Inside the app

A closer look.

Every preview below is rebuilt from the real app experience.

Search, faster.

Type / to open quick commands for translation, grammar, corrections, and more.

Mitsuki
GrammarJLPT N4

Two actions happening at the same time.

I study while listening to music.
駅まで歩きました。From your clipboard
Clear English, same tone
この問題は難しいだと思うFrom your clipboard
Needs a small fix — 58/100「だ」 can't follow an い-adjective.
この問題は難しいと思う
昨日、映画を見ったFrom your clipboard
昨日、映画を見た見る is ichidan — its past tense is 見た, not 見った.
AI

Sunlight leaking through leaves a famously untranslatable word. tree · 漏れ leak · sun.

From your clipboard
さくら NounCommon

cherry tree; cherry blossom

to go home — back to where you belong.

vs

to go back — to any previous point.

Review with everything close by.

Spaced repetition, plus the tools you need while the card is still in front of you.

Review Mode
Card 1 of 75 0/75 Reveal the answer
FrontMitsuki
絶えず
たえず
Hold, or press Space, to peek Reviewed 1×
絶えずたえず
Answer
  1. constantly
  2. always
They were constantly quarreling.
絶えずたえず
Answer
  1. constantly
  2. always
sever · cut off · discontinue
JLPT N312 strokes
On ゼツ Kun た・える
Word TrainerUse 絶えず in context.
Scenario

Describe neighbours who argue every night.

Your sentence

隣人は絶えずけんかしている。

Great job!Natural and correct.
92/100
Ask AIAbout 絶えず
What's the difference with いつも?
絶えず is literary "constantly, without pause", like a river. いつも is the everyday "always" habits, not flow.
Compare Usage絶えず vs 常に

Continuous. More written.

vs

Formal. Often used in rules or speeches.

Compare card added to your deck
Custom card — 木漏れ日Fill the rest in a tap.
AutoFillAI Fill
Readingこもれび
Meaningsunlight filtering through leaves
Example木漏れ日がベンチに落ちていた。

Cards with context.

Capture a line while you watch. Mitsuki keeps the frame, audio, and subtitle with your card.

Review Mode
Card 19 of 75 18/75 Choose a rating
チンタラ Seen on Naruto: Shippuden
Answer More
  1. to take a lot of time
Media
Captured frame from Naruto: Shippuden

(綱手) 遅い チンタラ!? ったく

subs2mitsuki mitsuki-extension

The scene stays with the word

Every captured card keeps the exact frame, so the word has a place in your memory.

Replay the audio

Replay the line and hear it again in context.

Tokenized subtitles

Subtitles become tappable words. Your target word is highlighted.

A deck that grows with you.

Your review health becomes a sakura tree. Keep reviewing, and it blooms.

Flashcards
75 left today Sakura streak 12
✦ Lv. 22 ❄ 2
Full Bloom
72of 100
Today's goal
Full Bloom
Bloom
Deck health
449Due
155New
86Learning

Your sakura tree

Your tree shows your deck health, from sprout to full bloom.

Achievements

Streaks, levels, and milestones help make review part of your day.

Achievement unlockedSakura Streak — 7 days in a row

Review notifications

Gentle reminders when cards are ready.

Mitsuki75 cards are ready.
now

And between reviews…

More ways to study, one tap from the dashboard.

Fill-in-the-blank

彼らは絶えずけんかばかりしていた。

いつも絶えずたまに

Cloze exercises from your own cards.

Grammar Study

N4
N3
N2
N3 grammar
12/40

Browse grammar by JLPT level and track your progress.

Study Diary

Mon雨。図書館で勉強した。
Tue新しいアニメを見始めた。
Wed単語を5つ覚えた!
14-day streak

Write a little Japanese each day, with corrections as you go.

Business lessons

行きます伺います
見ます拝見します
言います申し上げます
KeigoEmailMeetingsInterviews

Keigo, email writing, meetings, and interviews.

AI language tools

CasualPoliteBusinessCustomer
明日行くね 明日行きます 明日伺います 明日お伺いいたします
Naturalness
92

Adjust tone across six politeness levels and check naturalness.

Cloud sync

Mac
iPhone

Add on Mac. Review on iPhone. Stay in sync.

macOS

A quick bar for Japanese

Open Mitsuki from anywhere. Look up a word, save it, and get back to what you were doing.

Search, paste, or use a command…

Type a word, paste Japanese, or use a command.

Mitsuki Pro

Go further with Pro.

Search and flashcards are free. Pro adds more powerful AI tools.

  • AI study sessions built from your own words
  • Custom AI decks from topics or documents
  • Higher daily limits for AI features

FAQ

Questions, answered.

Everything you might want to know before you start.

Privacy

Privacy, built in.

Works without an account

Search and study on your device. Sign in only when you want sync.

Your data stays yours

Your flashcards and progress are protected for your account only.

No ads, no tracking

No ads. No analytics SDKs. No cross-app tracking.

身につく日本語

Start remembering Japanese today.

Look up a word. Save it. Review it when it matters — free, with no ads and nothing to track.

macOS 13 or later · iPhone coming soon