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Kakugo is an application that helps learning Japanese. It includes multiple tests to memorize hiragana, katakana, and kanji and adapts to the user's learning pace.

One of the biggest difficulty with learning Japanese is memorizing kanji and vocabulary. While learning them by just reading and writing them everyday may work, the more kanji you know, the harder it gets and the more time it takes to revise them all. Proper tools can help you memorize these huge amounts of knowledge to more quickly become a fluent Japanese speaker.

Kakugo is one of these tools. It helps learning and revising kanji and vocabulary in an efficient manner. It uses Spaced Repetition in a unique way that adapts to the user's pace. If you only have time to revise 30 kanji every day, or if you can revise as much as 100 kanji every day, Kakugo will adapt and test you on the right kanji at the right time for you to memorize them. There is no "kanji of the day" list to revise, you can start and finish a session whenever you feel like it.

Kakugo also features a wide variety of tests to help you find the best ways that will help you learn Japanese.


Features include:

  • Hiragana and Katakana quizzes
  • Kanji quizzes by reading and meaning
  • Kanji test by part composition
  • Kanji writing test
  • Vocabulary quizzes by reading and meaning
  • Unique spaced repetition formula that adapts to your own learning pace
  • Unlimited quiz sessions that allow you to take a quiz at any time, for however long you want, useful to efficiently spend commuting time
  • Show similar-looking kanji in answers to teach you the differences
  • Kanji and vocabulary sorted by JLPT level
  • Clicking on kanji opens aedict3 (a non-free Japanese dictionary) or
  • Optimized tablet support
  • Open source
  • No ads
  • No internet access required
  • Supported languages: English, French, Spanish, German
  • More to come


This app does not collect any personal data, only your progression and settings is saved on your device. No data is ever uploaded on the Internet, this app does not use the Internet access.



This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or any later version.


If you like this project and would like to thank me, I am open to donations. Do not forget to donate to the projects listed above from which most of the work comes.

Donate with PayPal.

Or if you prefer Bitcoin donations, here is my address: 12bnT7epKmf9ztkAeuM8dHCcoc76r9rgVX