# Katsuyokei: Conjugation — Verbs, adjectives and drills > Japanese verb conjugation practice app with adaptive drills and detailed feedback. (iPhone/iPad app by Jakub Dwojak.) - Source: https://appshunter.io/ios/app/katsuyokei-conjugation/id6802813564 (this page in markdown: same URL + `.md`) - Developer: [Jakub Dwojak](https://appshunter.io/developer/6801993670) - Category: Education, Reference - Price: Free with in-app purchases - Age rating: 4+ - Requires: iOS 18.0 · 3 MB - Languages: American English, Polish - Released: 2026-08-22 - Data updated: 2026-09-15 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/katsuyokei-conjugation/id6802813564/reviews.md ## What is Katsuyokei? Japanese conjugation is not a table to memorise. Either the form comes out without thinking, or it does not come out at all. Knowing that the te-form exists is not the same as producing 書いて without stopping to think. The first is understanding; the second is a reflex, and a reflex is built by repetition and feedback, not by explanation. WHAT YOU PRACTICE Verb classes – godan, ichidan, and the irregulars. Including the verbs that look like one class and behave like another: 帰る, 入る, 走る and 切る end in -る and are godan, and that is exactly where most mistakes live. Every form you actually need: polite ます forms, the plain negative, the plain past, the te-form and its sound changes, conditionals, potential, volitional, imperative, prohibitive, passive, causative, and the causative-passive along with its spoken contraction. Adjectives too – both kinds, including いい, which stops behaving like an adjective the moment you negate it. FIVE WAYS TO BE ASKED Pick the right form from four options. Type the form yourself. Name a form you are shown. Name the conjugation class. Take a conjugated word back to its dictionary form. The app moves you along that ladder on its own: a form you have just met starts with multiple choice, because typing something you have never seen is guessing, not practice. WHEN YOU GET IT WRONG You see the transformation, not a red cross. 書く → 書か + ない → 書かない, with one line explaining the rule underneath. No paragraphs in the middle of a session. WRONG ANSWERS THAT TEACH The distractors are the mistakes learners actually make. Practice the te-form of 帰る and you will be offered 帰て – the answer you would give if you thought it were an ichidan verb. MASTERY YOU CAN TRUST Three lucky answers do not show mastery, and five hundred wrong ones do not either. Progress is measured per form and per verb class separately, because the te-form of an ichidan verb and the te-form of a godan verb ending in ぐ are not the same skill. Sessions lean towards whatever you keep getting wrong. SESSIONS THAT FIT Five questions by default, fifteen in a longer session. A minute or seven, one tap from opening the app. No setup, no daily quota to configure, no streak to protect at midnight – the streak survives a missed evening and breaks after a missed day. ENGLISH AND POLISH Interface and content switch independently, so a Polish menu with English grammar terms is a normal combination rather than a compromise. PRIVATE BY CONSTRUCTION Everything stays on your device. No account, no sign-in, no analytics, no advertising, no tracking. The app makes no network requests at all apart from handling the purchase itself. It works in aeroplane mode. FREE AND PREMIUM Levels 1 and 2 are free in full – enough to reach the te-form, which is the point at which Japanese starts connecting into sentences. Premium is a single purchase that opens levels 3 to 5, the full vocabulary pool and weak-form practice. No subscription. Also from the same author: Kaname – Japanese Grammar, for when and why a construction is used, rather than how to build it. ## Key features - Automatic conjugation drills - Covers all verb forms - Practice all verb classes - Multiple question formats - Detailed error feedback - Progress tracking per form/class - Customizable session length ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Katsuyokei Premium | $2.99 | one-time | ## Frequently asked questions about Katsuyokei ### What Japanese verb forms does Katsuyokei cover? Katsuyokei covers all essential Japanese verb forms including polite ます forms, plain negative, plain past, te-form, conditionals, potential, volitional, imperative, prohibitive, passive, causative, and causative-passive forms. It also includes adjective conjugations. ### How does Katsuyokei track user progress? Progress is measured separately for each verb form and verb class. The app focuses on areas where the user makes mistakes, ensuring comprehensive mastery. ### What are the different practice modes in Katsuyokei? Katsuyokei offers five ways to be tested: picking the right form from options, typing the form, naming a shown form, naming the conjugation class, and returning a conjugated word to its dictionary form. ### Is Katsuyokei suitable for beginners? Yes, the free version of Katsuyokei includes Levels 1 and 2, which are sufficient to reach the te-form, a crucial step for forming Japanese sentences. The app starts with multiple-choice questions for new forms to avoid guessing. ### Does Katsuyokei require an internet connection? No, Katsuyokei is private by construction and works offline. It makes no network requests apart from handling purchases, allowing you to practice in aeroplane mode. ### What is the difference between the free and premium versions of Katsuyokei? The free version includes Levels 1 and 2. Premium unlocks Levels 3 to 5, the full vocabulary pool, and weak-form practice. Premium is a single purchase, not a subscription. ### How often is Katsuyokei updated? Katsuyokei was last updated on 2026-09-02 with version 1.1.1. The developer, Jakub Dwojak, also offers another Japanese learning app, Kaname. ### What is the age rating for Katsuyokei? Katsuyokei has an age rating of 4+ and is available on iPhone devices. ## Version history (last 5 releases) ### 1.2.1 — 2026-09-14 書かせられる is no longer wrong where it is right When the app asked for the short causative-passive (書かされる), it offered 書かせられる as one of the wrong answers. That is the same thing said at greater length – a correct form you were marked down for. Both are now accepted in both directions, and when you write the one we did not ask for, the screen says so plainly: this is right too, we asked for the other one. It counts as a hit. You can see where the contraction comes from The short causative-passive now has its own step in the breakdown: 書く → 書か → される, and under it 書かせられる → 書かされる with the one condition worth knowing about this form — godan verbs only, and never after す. Choosing an answer is now a tap and then Check Tapping a tile submitted the answer immediately, so a slip of the finger was indistinguishable from not knowing, and it went down as a mistake. Now the tile is selected, you can change your mind or undo it with a second tap, and the answer is only graded when you press Check. While nothing is selected, the button says what it is waiting for. Today no longer recomputes your progress nine times over The level bars, the weak spots and the numbers on the buttons each read the same progress separately, each from scratch. It is now computed once per redraw. Same numbers, lighter screen — especially during a session, since Today sits underneath it the whole time. ### 1.2.0 — 2026-09-12 Form explanations open right away Opening a form explanation took almost half a second, and the larger your text size, the longer it got. The cause was the thing this app is built on: the readings above the characters. Each of the twenty-eight labels on that screen was typeset again on every layout measurement, when once is enough. The screen now opens almost three times faster. Today no longer slows down after every answer The numbers on the four start buttons are honest – they say how many questions the material can actually produce, not how many you asked for. They were being recalculated after every single answer, though, and thirteen times over instead of three. Same numbers, no wait. The godan-or-ichidan question stopped giving itself away It offered four choices, but two of them – suru and kuru – could never be right for any verb this question is ever asked about. Anyone who knows which verbs are irregular could discard half the answers without knowing anything about the word. Now there are two choices, the two the word really sits between – because the question was always a question about one of two. When you transform one form into another, you can see where it changes "From the ta-form, make the conditional" first needs you to spot which part of the word is the stem and which is the ending. The part that changes is now picked out in your accent color – in the question, never next to an answer. With the system's Differentiate Without Color turned on, an underline is added. Every form now carries a short plain-language description "Make the ba-form" is not a question about Japanese until you know what a ba-form is. The name stays – underneath it there is now one sentence about what the form is for, for all twenty-five of them. ### 1.1.6 — 2026-09-10 Your Japanese now has a row for all ten apps Four more apps came out of the same workshop – Keigo, Onomatope, Kifuku and Shindan – and this one knew about six. The new rows stand at the end, in the order the apps were released, so nothing you had already got used to has moved. Four new cards in More Japanese Practice, each opening its App Store page A card that lands in App Store search instead of the app it names is a card you have to finish yourself. All four went in with the store identifier read from App Store Connect, so each one opens the page of the app it shows – and opens that app itself once you have it installed. Progress from the four new apps finally shows up here The rows read a small file each app leaves for its sisters, and the reading loop only ever asked about the apps it knew by name. Keigo, Onomatope, Kifuku and Shindan were writing theirs and nobody was looking, so their progress stayed invisible here no matter how much you did over there. ### 1.1.5 — 2026-09-08 The session bar is full when the counter says you are done The bar counted finished questions while the label counted the one in front of you, so at „7 / 7” it still had a sliver left, and on the first question it was empty. Two ways of saying the same thing, disagreeing by exactly one question, half a centimeter apart. Reduce Motion now switches this app's animations off Seven things moved when you tapped them — readings appearing, translations appearing, level sections folding open — and all seven ignored the iOS setting. For some people that motion causes nausea and dizziness, so it is not a matter of taste. With Reduce Motion on, the same taps do the same thing, immediately and without travel. If clearing your progress fails, the app says so Resetting is the one thing here that cannot be undone, and it was the one thing that could not report a problem: the app closed the dialog and said nothing, whether it had cleared anything or not. A failure would have surfaced days later, on the progress screen, with no way to connect it to what caused it. Purchase messages follow the language you picked in the app Choosing Polish inside the app left a few sentences behind in the phone's language — the purchase errors, and the mastery bar labels read out by VoiceOver. They were reaching for the system's translations instead of the app's, so one screen could end up in two languages at once. ### 1.1.4 — 2026-09-07 Every form name says what it means, right under the question „Make the attributive form” is a fair question only if you know what an attributive is — and nine of the twenty-five names this app asks by are grammar terms in English. The name stays, because it is the word you will meet in every textbook; under it there is now one plain line saying what the form does. It never mentions a single Japanese character, so it can stand before your answer without giving it away. A session never shows you the same screen twice Picking an answer from four and typing the same answer for the same word are two exercises in the app, but one screen for you — the same word, the same instruction, the same answer. Worse: the first one showed the answer among the four. Drilling a single form, this happened in fifty-nine sessions out of sixty. Sessions now count what you see, not how a question was built. A session gives you as many questions as the button promised Narrow sessions — one form, or only the irregulars — could end early and say nothing about it. The pick was cycling between three forms and refusing to repeat one, so when a form ran out of material the session kept asking it for a question it could not build, and stopped. The shortest session measured gave three questions where the button said twenty. New forms arrive in the order they are built from each other Levels came in order, but forms inside a level did not: the causative-passive could turn up before the causative it is built from. A form met before the one it derives from can only be memorised, not worked out. New forms now enter a session in catalog order, which is the order they teach each other in. Answer tiles are all the same height A tile whose answer wrapped onto two lines was twice as tall as the others, and a tile carrying readings above the kanji was taller again — so four answers looked like four different kinds of thing. When you are choosing between them, size means nothing and had no business looking as though it did. Your average answer time is written the way your language writes it In Polish it read „3.7 s” where Polish writes „3,7 s”. Nothing was broken and the number was right — it was simply written in the wrong language, which is the kind of fault that never gets reported. ## More apps by Jakub Dwojak - [Kaname: Japanese Grammar](https://appshunter.io/ios/app/kaname-japanese-grammar/id6801993668) - [Joshi: Japanese Particles](https://appshunter.io/ios/app/joshi-japanese-particles/id6803144744) - [Kazoekata — Japanese Counters](https://appshunter.io/ios/app/kazoekata-japanese-counters/id6803676309) - [Bunmyaku: Japanese Reading](https://appshunter.io/ios/app/bunmyaku-japanese-reading/id6804188062) - [Kuzushi — Casual Japanese](https://appshunter.io/ios/app/kuzushi-casual-japanese/id6805788146) All apps by Jakub Dwojak: https://appshunter.io/developer/6801993670 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-15.*