renshuu - Japanese learning

Review by eFreeware

Most free language apps make you wait. renshuu takes the opposite approach: the developer describes the free version as unlimited, with no timer that eventually pushes you toward paying. That single decision shapes everything else about the app, and it is the first thing I would point out to anyone comparing Japanese study tools.

The app is built for people who want to study Japanese seriously but on their own terms. It covers the writing systems, vocabulary, kanji, grammar and full sentences, and it maintains separate paths for popular textbooks, the JLPT and the Kanji Kentei, plus a path for learners who are not following any of those. If you have studied for a while and do not want to sit through material you already know, that structure is the appeal.

Fitting the app to your level and goals

The path system is the part I would look at first. Instead of a single fixed course, renshuu keeps tracks aligned with several common textbooks, the JLPT levels and the Kanji Kentei, and it lets you build your own sequence if none of those fit. The developer also notes that the community has contributed more than 10,000 lessons, which adds narrower material on top of the official paths.

That variety matters because Japanese learners arrive from very different places. Someone working through a textbook in a class wants drills that match the chapter they are on. Someone preparing for an exam wants coverage organized by test level. Someone learning for travel or reading wants vocabulary grouped by theme. The app tries to serve all three rather than forcing one route.

The trade-off with this much choice is that you have to make decisions. There is no single obvious starting button that carries everyone through the same sequence, and the developer leans into that by describing the settings as expansive and customizable. I would expect learners who enjoy tuning their own study routine to get more from it than those who want to be told exactly what to do next.

Vocabulary, kanji and grammar in depth

The vocabulary material is substantial. The developer lists over 15,000 audio clips recorded by native speakers, 17,000 chosen images and 160,000 example sentences, and there is a growing library of accent and pitch data aimed at learners who want to work on pronunciation rather than just recognition. For anyone who has struggled to hear the difference between similar-sounding words, that pitch material is a welcome detail.

Kanji coverage is similarly broad. The app holds more than 12,000 kanji with no stated limit on what you can study, and over 2,000 mnemonics are there to help meanings stick. Mnemonics are a personal thing, so the value depends on whether the developer's memory hooks match how your brain works, but having thousands of them means there is usually an alternative when one does not land.

Grammar gets its own treatment: more than 800 expressions, each with native-written model sentences, construction diagrams and audio, backed by over 7,500 handmade quiz questions. There is also a sentence library organized by theme and difficulty, with audio throughout. Between these three areas, the app covers the ground most learners need without sending them to a separate resource for each one.

How the quiz system handles Japanese

The quiz engine is where renshuu differs from a generic flashcard tool. It is an SRS designed around Japanese rather than a system that treats every item as a card to be memorized, breaking each item into its components so you understand the pieces instead of just the whole. Mastery scheduling then keeps weaker material in front of you and steps back the items you have solidly learned.

Question formats vary widely, and you can answer by multiple choice, by typing, or by writing. That flexibility is worth having, because recognition, recall and production are different skills, and being able to switch between them keeps a study session from turning into the same motion repeated for twenty minutes.

On top of the drills there are single-player and multiplayer games, which serve as a way to keep reviewing fresh. I would treat those as a supplement to the main study loop rather than the reason to install the app, but they give you something to do on a day when regular quizzing feels like a chore.

Kao-chan and the lighter side of studying

renshuu does not present itself as a stern study tool. The mascot, Kao-chan, sits at the center of a set of rewards: collectible coins for quizzing, a character that changes as you progress, manga pages you open along the way, and hundreds of hand-drawn illustrations. None of that changes what you learn, but it changes whether you feel like opening the app on a low-motivation evening.

The developer is also upfront about being a two-person operation that answers questions directly rather than routing them through chat bots. For an app with this much material and this many settings, that is a meaningful promise, since questions about how a particular path or quiz mode behaves are exactly the kind that a scripted help system handles badly.

The most recent update is a small one, covering color fixes in the menu. It tells you the app is being maintained, but it is not the kind of change that alters how you study.

What it costs and what you get free

The app is free to download, and the free version is unlimited rather than time-limited. There are no ads. In-app purchases are offered, but nothing indicates what they cover or that any part of the study material sits behind them.

That combination is unusual enough to be worth spelling out. renshuu's pitch is that the core experience is not gated that way, and the install figures suggest a lot of learners have taken that at face value.

The app has been downloaded over a million times and holds a 4.9 average across 15,670 ratings, with 1,440 written reviews. Those numbers reflect a large, apparently satisfied audience, though as always they tell you more about overall sentiment than about whether the app fits your particular goals.

How it compares with other ways to study

If you are weighing options, the main alternatives fall into a few groups. There are general-purpose flashcard apps, which are flexible but leave the Japanese-specific structure to you. There are textbook-and-workbook combinations, which give strong sequencing.

Then there are paid courses with fixed curricula. Those can be excellent for beginners who want a single clear route. renshuu's answer is a set of paths you choose between, with the option to build your own, and a free tier that is uncapped.

The closest comparison is probably a dedicated Japanese study service with its own SRS and content library. Alongside the drills, renshuu offers a wide range of reference material: pitch and accent data, mnemonics, grammar diagrams, and a sentence library. If you want one place that holds both your practice schedule and your reference material, that combination is the argument for it.

A strong fit for self-directed learners

renshuu is worth installing if you are studying Japanese and want a free app that covers vocabulary, kanji, grammar and sentences without ads or a session timer. Its strongest feature is the combination of a component-based review system with a deep reference library, and the path structure means you can start at your level rather than at the beginning.

It suits learners who are comfortable choosing their own route and adjusting settings to match how they study. If you are following a textbook, preparing for the JLPT or the Kanji Kentei, or simply building vocabulary on your own, there is a path or a set of community lessons that fits. The reward system and the games are there for the days when motivation is thin.

The app released in August 2020 and has been updated as recently as March 2026, so it is an established tool rather than a new experiment. Given the install count and the rating, my recommendation is straightforward: this is one of the more complete free options for Japanese study.

What's new in version 1.2.20260311

Minor color fixes in menu!