Kanji of the Day is a free educational app designed for Android users to enhance their understanding of the 2136 kanjis from the jōyō list, which includes characters taught from grade 1 through secondary school. The app offers a variety of features such as random kanji learning, sharing capabilities, and direct links to Wiktionary for additional definitions, making it a valuable resource for learners at any level. Users can easily navigate through grades and JLPT levels, providing a structured approach to mastering kanji.

In addition, the app includes interactive testing options where users can create personalized tests based on JLPT levels or educational grades. Performance tracking and reinforcement tests are available to ensure effective learning. The radicals list and tools for studying Hiragana and Katakana further enhance the learning experience, making Kanji of the Day an all-encompassing platform for those looking to improve their Japanese language skills.