Published August 4, 2026. Updated October 29, 2026

What is Moji - Learn Japanese Daily?

Moji - Learn Japanese Daily is a Japanese study app for iPhone and iPad built by Huy Bui, an independent developer. It was released on May 7, 2026, runs on iOS and iPadOS 18.0 and later, and is listed on the App Store under ID 6760421124. Its official website is moji.study. The app teaches from a single hand-curated catalog of 8,013 words, each one tagged to a JLPT level from N5 through N1, and schedules every review with the official FSRS-6 spaced repetition algorithm. Around that catalog sit 11 quiz modes, 12 guided conversations, and 33 narrated graded stories. There is no account, no server, and no cloud sync: the catalog and your progress live on the device.

If you arrived here trying to work out which “Moji” this is, the short version is at the bottom of the next section. There are several Japanese apps with similar names, and this one is the English-interface study app by Huy Bui.

What the app actually does

You study one card at a time. Tap to flip, swipe right if you remembered the word, swipe left if you did not. That two-button grading is the whole rating system, and it is a deliberate simplification of FSRS-6, which supports four grades. Fewer buttons means faster reviews and no time lost second-guessing whether a recall was “hard” or “good”. The scheduler runs the official FSRS-6 formulas with all 21 parameters (w0 through w20) at a 90% target retention, and it serves everything that is due, with no daily review cap. The full explanation lives on /fsrs, and the way the app visualizes memory strength is covered in memory bands and retrievability.

Every word carries a curated example sentence, 7,726 carry pitch-accent annotations, and 5,755 kanji words carry hand-edited mnemonics. An adaptive JLPT-aligned placement test sets your starting point, and home-screen and lock-screen widgets show a word, your streak, and what is due.

Around the flashcards sit three ways to use the words:

• Quizzes. Eleven modes: Vocabulary, Kana Reading, Listening, Fill in the Blank, Particles, Conjugation, Sentence Build, Pronunciation, Kana Writing, Kanji Writing, and a Daily Mix that blends them. The writing modes check stroke order stroke by stroke. A wrong answer comes back with its meaning and an example sentence.
• Conversations. Twelve guided scenarios: Convenience Store, Café, Restaurant, Clothes Shopping, At the Doctor, Airport, Taxi, Hotel Check-in, Train Station, Meeting Someone New, Making Plans, and A Friend’s Place. The other person says a line and you choose your reply. Conversations branch, so a run plays out a little differently each time. They are scripted and checked by hand, not generated by an AI model.
• Stories. Thirty-three short stories in six series, written for learners and narrated in two voices. Furigana appears only over words you have not learned yet, any word opens with a tap, and the English translation is there when you want it.

Every word, every level, the mnemonics, and the full schedule are free, along with the Vocabulary, Kana Reading, Kana Writing, and Daily Mix quizzes, the widgets, the Convenience Store conversation, and the first two stories of every series. Moji Premium, $8.99 per month or $49.99 per year, adds the other seven quiz modes, the other eleven conversations, the rest of the stories, and advanced progress views.

Is Moji the same as MOJi辞書, MOJi N5, or Moji - Learn Japanese & Kanji?

No. This is worth stating plainly, because “moji” (文字) simply means “characters” in Japanese and several unrelated apps use it.

MOJi辞書, also published as Mojidict, is a Japanese-Chinese dictionary suite made by a different company. It is a dictionary product for Chinese-speaking learners of Japanese. It is not related to this app in any way, and neither team is involved with the other.

“Moji - Learn Japanese & Kanji” is a separate study app published by a different developer under a similar name, with its own website at mojilearn.com. Also unrelated.

“MOJi N5-Vocabulary for JLPT N5” is a separate JLPT N5 word-list app from a different company, MOJI K.K. Also unrelated.

All three are legitimate products serving their own users. The point here is only identification, not comparison. What identifies this app:

If the app you are looking at is on Android, has a Chinese interface, or is published by anyone other than Huy Bui, it is not this one.

How it is built

The dataset starts from public sources and is then curated by hand. JMdict from the Electronic Dictionary Research and Development Group is the dictionary base. Frequency data derived from JPDB determines the study order. KanjiVG supplies the stroke-order data behind writing practice. Attribution for all three is included in the app under Settings, Credits.

None of that is shipped raw. Meanings are rewritten down to at most about three friendly glosses of 30 characters or fewer, with the parenthetical noise that dictionary entries carry stripped out. Usage notes are written only when there is a true, non-obvious, actionable fact to state, which is why 6,432 entries have one and the rest deliberately do not. Example sentences in the early study order are written to a strict difficulty budget, so an early card almost never asks you to read past more than one unfamiliar word. Retired entries go into a tombstone ledger rather than being deleted, so a catalog update never silently erases a learner’s progress. The full account of the standards and the review passes is at /how-we-curate-japanese-vocabulary.

The study order gets the same treatment. It is frequency-derived and then hand-edited, which is how core particles end up front-loaded: は (wa, topic marker) enters around position 63, が (ga, subject marker) around 89, か (ka, question marker) around 109, and を (o, direct object marker) around 129, each introduced with example sentences chosen to show where the particle sits in a sentence. That reasoning is unpacked at /why-word-order-matters.

Timeline

Moji - Learn Japanese Daily launched on the App Store on May 7, 2026. Development since then has been continuous and incremental, shipped as regular App Store updates rather than milestone releases. The most substantial scheduling change so far came in August 2026, when the daily review cap was removed and the scheduler began serving every card that is due. The reasoning behind that decision, including why the cap seemed like a kindness and was not, is written up at /why-we-removed-the-review-cap.

The app has also grown past flashcards. iPad support arrived in September 2026. October 2026 added the Pronunciation quiz, which checks your spoken answer on the device, and the guided conversations, which grew from one scenario to twelve within a week.

Philosophy

Small, focused, and Apple-native, with quality preferred over volume.

Small and focused means one curated deck instead of a deck marketplace, one rating gesture instead of a configuration screen, and practice built on the same words you are learning rather than on a separate syllabus. The quizzes, conversations, and stories all draw on the catalog. Moji is not a grammar course or a tutor: the Particles and Conjugation quizzes drill forms, but they do not teach grammar from scratch, so it expects to sit alongside a textbook or course. If you are assembling that stack, /after-duolingo-japanese is an honest map of what goes where.

Apple-native means built with the platform rather than wrapped in it: widgets on the home and lock screen, pronunciation checked on the device, story narration that ships with the app and plays offline, and a design that behaves like an Apple app. That is also the constraint. There is no Android version and none is planned, because one developer maintaining two platforms would mean doing both worse.

Quality over volume means the catalog is 8,013 words and stops there. Every meaning, example sentence, and mnemonic is reviewed and edited by hand rather than bulk-imported. A larger number would be easy to produce and would make the App Store listing look better. It would also hand you entries nobody checked, and finding out which ones those are is your time, not ours.

Read how it works

Every claim above has a page behind it:

• /method, the one-screen map of curation, ordering, scheduling, and sentences
• /fsrs, why FSRS-6 rather than SM-2, and what 90% target retention means
• /how-we-curate-japanese-vocabulary, sources and standards for the catalog
• /why-word-order-matters, frequency ordering and front-loaded particles
• /example-sentence-difficulty, the one-untaught-word budget
• /kanji-mnemonic-method, the component-hook mnemonic format
• /how-many-words-for-jlpt, per-level word counts
• /anki-alternative-japanese, an honest comparison including where Anki wins

Contact

Questions, corrections, and bug reports go to support@moji.study. Corrections to the catalog are genuinely welcome; a wrong gloss is a bug.

Moji - Learn Japanese Daily is free to download, and the comprehension path stays free with no time limit, so you can see whether the approach suits you before deciding anything. If you are weighing it against other apps first, we ranked the field in the best iPhone app to learn Japanese. Download Moji on the App Store

Sources

• App Store listing, Moji - Learn Japanese Daily, App Store ID 6760421124.
• JMdict / EDICT, Electronic Dictionary Research and Development Group, https://www.edrdg.org (Creative Commons Attribution-ShareAlike 4.0).
• KanjiVG stroke-order data (Creative Commons).
• JPDB-derived frequency data.
• FSRS-6 algorithm, Open Spaced Repetition, https://github.com/open-spaced-repetition