Updated August 8, 2026

Best Kanji App With Mnemonics: An Honest Comparison

Short answer: the three mnemonic methods worth your time are Heisig’s Remembering the Kanji, WaniKani, and Moji - Learn Japanese Daily for iPhone, and they differ mainly in what the mnemonic is attached to. RTK attaches one English keyword to each character and asks you to write the story yourself. WaniKani attaches named radicals to characters and characters to vocabulary, on a fixed level ladder. Moji attaches component hooks to whole vocabulary words, ordered by how often you will actually meet them, so a kanji shows up inside a word instead of on its own. If you want to read Japanese sooner, the vocabulary route gets you there faster. If you want to write 2,200 characters from memory in a few months, RTK still wins.

The three kanji mnemonic methods at a glance

How Heisig’s RTK keyword stories work

Remembering the Kanji volume 1 covers 2,200 characters, giving each one a single distinct English keyword and breaking it into “primitives,” the written components you recombine into a memorable scene. The sequence is deliberately not frequency order and not the school grade order; characters are arranged so each one builds on primitives you already know. Volume 1 also skips readings entirely, on the argument that meaning and writing should land first. Readings come in volume 2, which revisits the same 2,200 characters in a different order. (Wikipedia)

That design has a real payoff and a real cost. The payoff is speed and writing ability: a keyword is a small thing to carry, so people move through the book fast and can reproduce characters from memory. The cost is that at the end you can write 大丈夫 but you cannot say だいじょうぶ (daijoubu, “okay, all right”), because the book never taught you a reading or a word. RTK graduates typically follow with a vocabulary phase to close that gap.

How WaniKani’s radical-name mnemonics work

WaniKani, from Tofugu, teaches roughly 2,000 kanji and 6,000 vocabulary words through a fixed level sequence, moving radicals to kanji to vocabulary and using spaced repetition throughout. Every radical, kanji, and vocabulary item comes with a mnemonic already written for you, and because every radical carries a name the stories reuse, the imagery stays consistent across thousands of items. Levels 1 to 3 are free; beyond that it is $9 per month, $89 per year, or $299 for lifetime access. (WaniKani, pricing, free levels)

The consistency is the point and also the trade. Because the radical names are a closed system, the stories compose beautifully, and you never have to invent one. Because the order is a fixed ladder, you learn what level 12 contains when you get to level 12, whether or not those words are the ones you keep hitting in the material you read.

How Moji ties kanji mnemonics to real vocabulary

Moji does not have a kanji course sitting next to a vocabulary course. There is one catalog of 7,435 words, ordered by frequency and then hand-edited, and kanji arrive inside those words. 5,300 entries carry a hand-written mnemonic. The house rule is that a mnemonic must hand you something the card does not already show: not the headword restated, not the meaning restated, but a hook that brings the word back when you meet it cold.

Two shapes cover almost everything. Decomposable words name their real components with a gloss each, then fuse them into one concrete image. Pictographs skip the breakdown and go straight to the picture. Here is the second shape, the actual mnemonic for 水 (みず, “water”):

A central stream with droplets splashing off both banks as it rushes past.

Components named in a mnemonic have to genuinely appear in the character. Folk imagery is allowed when it is framed as what the shape looks like, never as invented etymology. And entries where no honest hook exists stay blank on purpose: transparent loanwords, derived forms taught through their base word, function words with nothing to grab. A forced mnemonic is worse than none. The full method, including the sound-hook rules and why kana words are handled differently, lives at the kanji mnemonic method.

Why kanji through vocabulary changes what a mnemonic can do

An isolated-character mnemonic has to survive on a keyword. The keyword “cat” is fine, but in the wild the character turns up as 猫 (ねこ, “cat”), and the reading is what you need to hear it, say it, and find it in a sentence. When the mnemonic sits on a whole word, the card already shows the reading, the pitch accent, the curated meaning, and an example sentence, so the mnemonic can spend its whole budget on the recall hook rather than doing dictionary work.

The order matters just as much. RTK’s sequence optimizes for component build-up and WaniKani’s for its level ladder. Moji’s is frequency-derived, with core particles deliberately pulled forward, so the characters you meet first are the ones you will hit first in real Japanese. That is a different bet: fewer characters early, but each one immediately usable. More on that reasoning at why word order matters and the most common Japanese words, and on how the meanings and example sentences get curated at how we curate Japanese vocabulary.

Kanji writing practice with stroke feedback

Recognizing a kanji and producing it from a blank square are different skills, and mnemonics mostly train the first one. Moji has writing practice for both kanji and kana, with stroke feedback drawn from KanjiVG, the Creative Commons stroke-order dataset. The build step pulls ordered stroke paths for every kanji and kana that appears in the catalog, so a character you can study is a character you can trace.

Kana writing is free. Kanji writing is part of Moji Premium, along with the listening, cloze, and weak-words quiz modes. The free tier is the whole comprehension path: flashcards with mnemonics and example sentences, kana writing, vocab and kana quizzes, and the Daily Mix. Scheduling is FSRS-6 with all 21 parameters and a 90% target retention, on a two-button swipe, described at how FSRS works in Moji.

Choose Heisig’s RTK if…

You want to write kanji from memory, you like doing the creative work of building your own stories, and you are comfortable spending a few months on characters before you can read a sentence with them. RTK is a book method with decades of community material behind it, and nothing else gets you to “I can produce 2,200 characters” as directly. Pair it with an SRS you already run; see the Anki alternative comparison if you are weighing that setup.

Choose WaniKani if…

You want every mnemonic written for you in a single consistent radical vocabulary, you like a visible level ladder to climb, and you study on a computer as much as a phone. WaniKani’s stories are written by people who do this full time, the community around it is large and helpful, and the fixed ladder removes every decision about what to study next. If a lifetime purchase suits how you buy software, its lifetime option has no equivalent here.

Choose Moji if…

You study on an iPhone, you want kanji to arrive inside words you can use rather than as a separate project, and you would rather follow frequency than a fixed ladder. Moji is iPhone-only with an English interface, there is no Android version, and it will not teach you to write 2,200 characters in a hurry. What it will do is put the 7,435 most useful words in a sensible order, with hand-written hooks on the 5,300 that earn one. For the direct feature-by-feature comparison, see the WaniKani comparison.

A quick disambiguation: this is “Moji - Learn Japanese Daily,” not the similarly named app in the App Store, and the scheduler is FSRS-6 rather than the older SM-2 family.

If the vocabulary-first version of kanji sounds like the one you have been missing, the free tier is the whole comprehension path, so you can find out without paying anything: Moji is on the App Store.

Sources

• Remembering the Kanji, method and scope: https://en.wikipedia.org/wiki/Remembering_the_Kanji
• WaniKani method, kanji and vocabulary counts: https://www.wanikani.com/
• WaniKani subscription pricing: https://knowledge.wanikani.com/account-and-membership/payment-and-billing/subscription-plans/
• WaniKani free levels: https://knowledge.wanikani.com/getting-started/payment-and-billing/wanikani/wanikani-free/
• KanjiVG stroke-order data: https://github.com/KanjiVG/kanjivg
• JMdict dictionary data (EDRDG): https://www.edrdg.org