Japanese Numbers Free is an Android app developed by PayToPwn, available for free in the Education & Reference category. This app helps users learn Japanese numbers with ease. It comes with a tutorial and a list of all the Japanese characters (kanji) used in numbers. Additionally, it offers a converter from western numbers to Japanese numbers (kanji) with the western reading (romaji). With a multiple-choice test, users can test their knowledge of kanji by reading and writing them.

The app's UI is user-friendly and straightforward, making it easy to navigate. The tutorial is informative and well-structured, providing a clear understanding of the Japanese number system. The list of kanji characters is comprehensive, containing all the necessary information one needs to learn Japanese numbers.

However, the app contains ads, which can be distracting at times. Overall, Japanese Numbers Free is an excellent app for those looking to learn Japanese numbers, and it's highly recommended for beginners.