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
Really easy to use, engaging and beginner friendly. Exactly what I was looking for as a complete beginner in Japanese. 10/10 would recommend to anyone wanting to pickup Japanese without too much time and effort investment.
Developer Response
Thank you for your review. If you have any questions or suggestions please don’t hesitate to reach to us via support@kaeru-jp.app
Kanji writing needs improvement
Freezeyxdwdt
I think that this app has potential. However it is annoying that the screen shakes whenever a stroke is considered wrong on a kanji. It really is distracting and hard on the eyes, especially when the stroke is mostly right but is just judged as incorrect by the algorithm. Letting the stroke fade into the background and ticking up a small counter for error strokes could be better. Shaking the screen is disruptive.
Developer Response
Hi Freezeyxdwdt, thanks for the thoughtful feedback - and good news: 1.4.6 just shipped with the screen shake significantly toned down for incorrect strokes. Should be much less disruptive now. Your suggestion about fading strokes and a small error counter is interesting too - we’ll keep iterating on the feedback design. Give the update a try and let us know if it feels better!
Review
JennSH2001
The app is great!! Straight to the point and works pretty fast My favorite is the fact that the app does not attack you with notifications the way DuoLingo does
Developer Response
Thank you for your feedback! We are happy that you like Kaeru. If you have any questions or suggestions please send us a word on support@kaeru-jp.app
Super cool concept, unstable app
Lightningshy
This app is really neat, but doesn’t work. It crashes every time I’m working on writing practice, and is unusable for anything other than flashcards.
Developer Response
Hi - this one's fixed. The crash came from the app's first-time setup getting interrupted before the kanji data finished unpacking, which left writing practice without the data it needed. The latest version checks for that on launch and finishes the unpack automatically, so writing practice should just work now - no reinstall needed. Sorry it was rough before - give the update a try and let us know if anything else trips up: support@kaeru-jp.app
Your daily journey now always mixes fresh words in with your review, so every session moves you forward. Plus, you can now hear example sentences read aloud right on your flashcards.
New
- Tap to hear example sentences spoken aloud on any flashcard.
- Copy words and example sentences straight from dictionary entries.
- Replay the passage as many times as you like in daily journey reading practice.
- Clearer feedback on your reading - see which words you got right and which ones need a little more practice.
- Furigana now appears above kanji in reading practice, so you always know how to read them.
Improved
- Your daily journey now keeps a healthy balance, with fresh words making up a meaningful part of every session so you keep growing, not just reviewing.
- The dictionary now focuses on everyday vocabulary, with more specialized words organized into dedicated packs - you can still find all of it in the dictionary whenever you need it.
Fixed
- The Skip button now works as expected.
- Words that are usually written in kana now display correctly.
- Audio now plays at the right volume.
We've also made the app faster and more reliable throughout
Version 1.4.9
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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
Identifiers
Usage Data
Data Linked to You
The following data may be collected and linked to your identity:
Identifiers
Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
User Content
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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
