"Learn Japanese Kanji Fourth Grade" is an educational application for learning Japanese characters. It provides an introduction to the basics of the language for those who are planning to take the JLPT test.

The application is divided into five parts:

The first part is an introduction to the basics of the language, including vocabulary, grammar, and punctuation.

The second part is an introduction to the Japanese writing system.

The third part is a review of the first grade.

The questions in each grade are divided into two parts: one is a multiple-choice question and the other is a free-answer question. 

There are 1026 Japanese kanji in the application, and they are arranged into six levels.