Yukimoji is a comprehensive tool for learning Japanese, bringing together everything you need to build real confidence in the language: 2,000+ kanji, thousands of high-frequency vocabulary items, and hundreds of essential grammar patterns. Rather than studying these elements in isolation, Yukimoji connects them into one seamless path toward mastery. Our frequency-optimized study system helps you learn kanji, vocabulary, and grammar in the order most useful for real-world understanding, so you can make meaningful progress as quickly and efficiently as possible.
The shape of the system
Three ideas drive how Yukimoji teaches. The first is spaced repetition: cards come back on a schedule tuned to how well you actually remember them. Easy cards stretch out to weeks and months; cards you keep forgetting stay close. You don't decide when to review — the algorithm does, and it gets better at it the more data you give it.
The second is prerequisite ordering. Vocabulary is never introduced before the kanji it uses. Kanji are never introduced before the radicals they're built from. If you encounter the word 食べる (taberu, "to eat"), you'll have already learned the kanji 食 in a previous lesson, and the radicals that compose 食 in lessons before that, ensuring minimal cognitive load and maximum pedagogical usefulness.
The third is i+1 example sentences. Every vocab word ships with five example sentences, each containing exactly one new element you haven't yet learned. You're never reading a wall of unknowns; you're reading a sentence where the only mystery is the word being taught. Comprehension is built one piece at a time.
Two ways to start
You'll pick a study mode in Settings. Both end up in the same place — fluency — they just take different routes.
Vocab-first introduces words right away. When a word needs a kanji you don't know, the kanji (and any unlearned radicals it depends on) are slotted into the lesson queue right before the word that needs them. You'll see your first vocab on day one. The trade-off is that you're meeting kanji in scattered order driven by usefulness, not by formal classification.
Kanji-first defers vocab until you've worked through every kanji on its own. You can choose JLPT order (N5 → N4 → N3 → N2 → N1) or raw frequency. The first few months are slower because you're not yet using the kanji in context. But once vocab unlocks, it unlocks fast — every word is built from pieces you already know.
Most learners do better with vocab-first. The constant context makes kanji stickier, and seeing your first real Japanese sentence on day one is enormously motivating. But if you're a systematic personality, or if you've tried language apps before and bounced off feeling like you weren't really learning the characters, kanji-first can suit better. No worries, you can switch any time; progress carries over.
A typical session
Open the app. The home screen shows what's due. Reviews come first — cards you've seen before that the algorithm thinks you might be on the edge of forgetting. Then lessons — new items, capped at whatever daily limit you've set.
During a card, you see the front (a kanji, a word, a radical). You try to recall its meaning and reading. Press Space to flip. The back shows the answer. You grade yourself with one of four buttons:
- 1 Again — you forgot, or got it wrong. The card comes back in 10 minutes.
- 2 Hard — you got it but it took effort. The interval grows, but slowly.
- 3 Good — you remembered with normal effort. This is the default for most cards.
- 4 Easy — instant recall, no hesitation. The interval grows aggressively.
That's the whole loop. Lessons introduce the item with full teaching content (mnemonic, readings, definitions, an i+1 sentence) before you ever grade it; reviews are the recall test.
How to actually stick with it
The single biggest predictor of success in language learning isn't intelligence, talent, or which app you picked. It's consistency. Twenty minutes a day for a year beats four hours a day for a month every time, because spaced repetition only works if the spacing happens.
Pick a small daily-new cap and stick with it. New learners consistently overestimate how many cards they can sustain. Twenty new cards per day sounds like nothing, but those cards come back as reviews — and a year in, you're doing 200+ reviews daily on top of new lessons. Start at 10 or 15. You can always raise it later; lowering it is psychologically harder.
Be honest with your grades. The algorithm is only as good as the data you give it. If you mark Good when you really had to think for five seconds, the algorithm assumes you knew it comfortably and pushes the next review further out — and you'll have forgotten it by then. Hard is not a stigma; it's a useful signal. Again isn't punishment; it's how learning happens.
What's in the rest of these guides
The following guides cover the absolute foundations of Japanese — the things you'll want a 15-minute reference for before they become second nature through reps. Read what's relevant, skip what isn't, come back when you hit a wall. None of this is gated; you don't have to "complete" any of it before starting lessons. The lessons themselves teach by doing.