Flashcards for kana and kanji, a red pen that checks handwriting, printable worksheets and read-aloud picture books — ad-free apps for kids learning Japanese, especially outside Japan.
Learn the characters, write them by hand, then read them in real stories — five apps, one path.
Learn · Kana
Hiragana and katakana, one card at a time
Where reading Japanese begins. Flashcards for all 46 hiragana and 46 katakana, with animated stroke order, an exam mode and a practice deck built from the characters you miss.
Learn · Kanji
All 1,026 elementary-school kanji, in one app
On’yomi and kun’yomi flashcards for every kanji taught in Japanese elementary school, grades 1 to 6 — with animated stroke order, spoken readings and an exam that shows exactly which kanji need more work.
Write · On iPad New
Copy a passage, get it marked like a teacher’s red pen
Kids copy a short Japanese passage with Apple Pencil, and every square gets a red ○ or a gentle × — stroke order, stroke count and small kana included. Fix only the × squares and earn a 花丸.
Write · On paper
Turn any kanji into a printable worksheet
Type this week’s kanji and get a print-ready worksheet: a vertical tracing page drawn from real stroke-order data, plus a fill-in-the-blank test with furigana hints.
Read · Picture books Coming soon
Japanese picture books, read aloud
A library of picture books written only with the kanji a child has learned — hiragana, grade 1 or grade 2. A warm voice reads each page while the words light up, and new stories arrive every month.
koshilab builds educational apps that make learning Japanese fun and effective, for kids growing up between two languages. We started with flashcards for hiragana, katakana and kanji, added 漢ドリ, which turns any set of kanji into a worksheet you can print, and まるつけ, which checks a child’s handwriting on iPad like a teacher’s red pen. Next is おはなし, a library of picture books written only with the kanji a child has learned. Every app is ad-free, privacy-first, and follows the official Japanese school curriculum.
Recognize characters with flashcards, practice the strokes on printable worksheets, then meet them again in real stories.
Built for the devices kids already use — flashcards and books on iPhone and iPad, handwriting on iPad with Apple Pencil. Android is on the way.
No ads, no tracking, no social features. Your data stays on your device — or in your family’s own iCloud.
Progress is saved on your device, so you can review and move on at a comfortable speed.
Our first iPad app is for writing. Kids copy a short, grade-level passage with Apple Pencil, and every square is marked like a teacher’s red pen — stroke order, stroke count, small kana and punctuation. Only the × squares open again, so they fix what needs fixing and earn a 花丸. It also reads each passage aloud, records your child reading it back, and keeps a seasonal sticker book.
Our next app is a library of Japanese picture books for young readers. Every book is written for one level — hiragana only, first-grade kanji, or second-grade kanji — and read aloud with each word lighting up as it’s spoken. The stories are about kids living between two cultures: Tanabata wishes with Grandma over a video call, a first summer festival in Japan, onigiri in an American lunchroom.
The six per-grade 音訓 apps are now one. Grades 2 through 6 join grade 1, so a single app covers all 1,026 kanji taught in Japanese elementary school. Pick a grade from the start screen and switch any time — each has its own colour and logo, and study, exam and practice modes all work per grade. Existing first-grade users keep their score history, and the five separate grade apps have been retired.
Our worksheet app is live. Type in any kanji and 漢ドリ builds a printable practice sheet: a vertically typeset tracing page with five boxes per character, then a fill-in-the-blank test with furigana hints. Made for practice away from the screen — the output is a piece of paper, not another quiz.
Tap a card in study mode and the character now draws itself one stroke at a time, in the correct order, from real stroke-order data. This update also adds iPad support, a redesigned app icon, and Reduce Motion support — and the readings for all 80 first-grade kanji were reviewed so each card shows the sense taught in first grade.
Our first app that isn't flashcards. Type up to 10 kanji and 漢ドリ builds a practice worksheet you can print: a tracing page with five boxes per character, and a fill-in-the-blank test. Readings come from a bundled dictionary covering all 2,136 jōyō kanji. Coming soon to iOS.
All 80 first-grade kanji, each with on'yomi and kun'yomi readings, stroke count, and example words.
The app that started koshilab — the 46 basic characters of hiragana and katakana, one card at a time.
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