Katsuyokei: Conjugation
Verbs, adjectives and drills
About
Master Japanese verb conjugations through repetitive drills and targeted feedback. Practice all essential forms and verb classes with varied question types. Progress is tracked individually for each form and verb class, ensuring true mastery.
What's New in Katsuyokei
1.5.0
October 19, 2026
Between choosing an answer and typing it, you can now assemble a form from tiles. Practice the stem and endings separately before moving on to the keyboard. A phone fell, or someone dropped it? New questions give you a situation and two related verbs in the same form. After your answer, you see both meanings and why one fits the scene. The small widget shows how many answers remain towards your daily goal and opens practice. Medium and large widgets show your progress across the Japanese app family. Settings now include Kifuku for pitch accent and previews of six more Japanese learning apps. You can also open each available app’s website from its card.
MoreSubscriptions & In-App Purchases
$2.99
Katsuyokei Premium
One purchase. Levels 3–5 and the full word pool.
Developer apps
FAQ
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.
