MrSensei Hiragana Katakana is an Android application developed by Jaime Toledo that provides a convenient way to learn Japanese characters. It falls under the Education & Reference category and is available for free. The app allows users to choose between two syllabaries, Hiragana or Katakana, and offers a range of exercises to practice with.

The app's interface is user-friendly, and users can customize their exercises by selecting the characters they want to work with. This feature makes it easier for learners to focus on specific areas where they need improvement. With MrSensei Hiragana Katakana, learners can start their custom exercises anywhere, anytime, making it a convenient tool for those who want to learn Japanese characters on-the-go.