Written by Rahul Kumar Singh · Published 4 July 2026
Spaced repetition — reviewing something right before you'd forget it — is the closest thing language learning has to a cheat code. Most people meet it through apps, and apps are fine. But you don't need one. The original system runs on paper, costs nothing, sets up in ten minutes, and has one advantage no app can match for Japanese: your hand practises the writing while your brain practises the meaning.
The Leitner Box: Four Pockets
Take any box, or four envelopes, or a rubber band and some patience. Label four sections:
- Pocket 1 — Daily. New cards and cards you recently got wrong.
- Pocket 2 — Every 3 days.
- Pocket 3 — Weekly.
- Pocket 4 — Monthly. The cards you basically own.
The rules are the whole system:
Answer a card correctly → it moves up one pocket.
Answer wrong → it goes all the way back to Pocket 1.
That's it. Hard cards automatically get seen often; easy cards automatically get out of your way.
Daily load: all of Pocket 1 (keep it under ~20 cards), plus whichever other pockets are due that day. Ten to fifteen minutes covers it — it slots neatly into the review-first block of a daily routine.
How to Make Cards That Actually Teach
The quality of the system is decided when you write the card, not when you review it.
- Vocabulary cards: Japanese word on the front (in kana/kanji — no romaji), meaning plus a short example phrase on the back. A word without context is a fact; a word inside a phrase is a tool.
- Kanji cards: character on the front; meaning, reading and two real words on the back. When you review, write the character in the air or on scrap paper before flipping — with proper stroke order. This is the step apps can't force you to do, and it's where paper quietly wins.
- Grammar cards: a fill-in-the-blank sentence on the front ("学校＿＿行きます"), the missing particle and a one-line why on the back. Grammar sticks as patterns, not as rule statements.
- One fact per card. A card with five readings and four meanings is five cards pretending to be one, and it will fail as all five at once.
You don't have to hand-write everything from scratch: the printable flashcard packs on this site cover kana and level-by-level kanji, ready to cut out — and the vocabulary lists give you word + reading + meaning in exactly card-shaped pieces.
Paper vs Apps, Honestly
- Apps win at: scheduling precision, huge decks, audio, studying in a queue with one thumb.
- Paper wins at: handwriting practice built into every review, no notifications pulling you into other apps, the strangely real satisfaction of physically moving a card up a pocket — and working during power cuts and data-pack droughts, which matters where I live.
Plenty of learners run both: an app for listening-heavy vocabulary, paper for kanji where the hand matters. There's no rule that says pick a side.
Set It Up Today
- Make (or print) twenty cards from your current level's vocabulary.
- Put them all in Pocket 1.
- Tomorrow, review them. Movers move up; stumbles stay.
- Add five to ten new cards a day, and let the pockets do the scheduling for you.
Within two weeks you'll have a self-organising review system where every card appears exactly as often as you need it to — which is the entire promise of spaced repetition, minus the subscription.
Rahul Kumar Singh
I build and write NihongoDoya. I'm a Japanese learner from Nepal — currently preparing for the JLPT N4 at a language school with native Japanese teachers — and I publish the study system I use myself, free for everyone. More about me · Say hello