New in 2.1: sign in and your words, kanji and streak stay in sync on iPhone and iPad. Made for iPad, with landscape and faster pronunciation scores.
Kaeru teaches Japanese writing, grammar, and pronunciation in one app. No juggling five tools. No guessing which resource covers what. You open Kaeru and study.
WRITE KANJI FROM MEMORY
Most apps show you a character and ask you to pick the right answer. You pass the quiz and feel confident. Then you face a blank page and draw nothing.
Kaeru puts you in front of that blank page from day one. You draw each character stroke by stroke, building recall that transfers to real writing. 13,108 kanji with correct stroke order. Every character includes native audio, readings, and meanings.
iPad users: Apple Pencil turns your screen into a kanji notebook.
GRAMMAR THAT EXPLAINS ITSELF
828 grammar patterns from N5 to N1. Formation rules, context, example sentences, and audio for every pattern. Browse by JLPT level or search for a specific construction.
You read は vs が in 50 different patterns instead of one confusing chart. Particles click when you see them used, not described.
SRS THAT ADAPTS TO YOU
Skip two days with most SRS apps and you return to 200 pending reviews. The pile grows. Motivation drops. You quit.
Kaeru's spaced repetition tracks your memory for each item and schedules reviews before you forget. Strong items space out. Weak items repeat sooner. Miss a few days and the system adjusts instead of punishing you.
DAILY JAPANESE STORIES
A new story every day, matched to your JLPT level. Native audio at adjustable speed. Tap any word to translate. Grammar breakdowns for every sentence. A comprehension quiz at the end.
Stories put your kanji and grammar into real context. You see characters used, hear them spoken, and test yourself.
PRONUNCIATION SCORING
You study for months, open your mouth, and the words come out flat. Nobody corrects you.
Kaeru's AI coach listens. Record yourself and get scored on pitch accent, fluency, and accuracy. Feedback after every attempt. Fix pronunciation problems before they become habits.
JLPT N5 THROUGH N1
Curated decks for every JLPT level covering kanji and vocabulary. Each deck maps to your target exam. Track your progress toward a specific level so study hours count on test day.
BUILT-IN DICTIONARY
Search by romaji, hiragana, kanji, or English, Spanish, Korean. Every entry shows readings, meanings, JLPT level, and stroke count.
ONE APP INSTEAD OF FIVE
Grammar reference. Kanji handwriting. Vocabulary decks. Spaced repetition. Pronunciation scoring. Daily stories. Dictionary. Progress tracking. One subscription covers everything.
Stop splitting your study across a kanji app, a grammar app, a flashcard app, and a pronunciation tool you opened twice.
Who uses Kaeru: learners who know hiragana and katakana. JLPT test preppers from N5 to N1. Anyone tired of recognizing kanji without being able to write them.
All features require a subscription or one-time purchase.
Privacy Policy: https://kaeru-jp.app/privacy-policy
Terms of Use: https://kaeru-jp.app/terms-of-use
The good: it mirrors what I’d be doing in class for learning the words, reading and listening to the passage for comprehension, and learning the kanji through writing all in a neat little package. But lacks things like grammer deep dives or conversation practice. The bad: already there’s errors, such as 「空き」 it says “あき”but the voice says “つうき”. So which one is it? It doesn’t say, so I may be learning the wrong word the whole time. The kanji stroke thing is so Janky, that it makes it extremely frustrating since it adds this annoying shake animation. Enough to make you want to quit the app. Lastly, making me sign up for a subscription to even know what the app is like, for a 3 day trial and forced to pay for a whole year seems like a scam. Let me try before I buy? If you’re a good app, people would sign up. No need to trap people into the app.
Developer Response
Really appreciate you taking the time to write this out - the 「空き」 catch especially.Quick update: we’ve just shipped 1.4.4 with the fix. To pick it up, update to 1.4.4 and re-download the Kaito voice package (Settings → Voices). The audio will then match the written reading.The stroke shake is actually intentional - it’s how we indicate a stroke went in the wrong direction or order. I understand it can feel harsh though. Would you want an option to turn it off entirely? Easy to add.On the subscription: whether to subscribe is completely up to you, and that’s exactly why we offer the 3-day trial first. If it doesn’t click during the trial, cancellation through the App Store takes seconds. That’s pretty standard for subscription apps, and we’d rather someone try it and walk away than feel stuck.
Kaeru 2.1 keeps your progress with you, on every device.
• Sign in to keep your words, kanji, streak and progress safe and in sync on your iPhone and iPad.
• Made for iPad: a sidebar, your Dictionary results and the word side by side, and more room for lessons, flashcards and your decks.
• Use Kaeru sideways on iPad and iPhone.
• Keyboard shortcuts on iPad, like Space to flip a flashcard and ⌘F to search.
• Pronunciation scores arrive faster.
Plus bug fixes and small improvements.
Version 2.1
The developer, Rozemyne Ltd, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
Contact Info
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
User Content
Identifiers
Usage Data
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
