Coban is a free Android app developed by Akira Noguchi, designed to help learners of Japanese master basic grammar, vocabulary, pronunciation, and kanji. This app offers a variety of exercises and tools to help users learn and retain knowledge of the language.

One of the most notable features of Coban is the audio files that are available for all materials. This allows learners to listen and learn the correct pronunciation of words and phrases. The app also covers more than 800 words needed to pass the JLPT N5, making it a useful tool for those preparing for the exam.

In addition to vocabulary, Coban offers grammar tips that cover basic and advanced concepts. The app also tracks your progress and displays it on your profile page to motivate you to continue learning. Overall, Coban is a comprehensive learning app that offers a variety of exercises and tools to help learners of Japanese improve their language skills.