Katakana Memory Hint English is a free educational app developed by The Japan Foundation, available on Android. It uses mnemonic pictures to help users learn the katakana characters and quizzes to check their understanding. The app is recommended for complete beginners in Japanese and those interested in Japanese letters. It features pictures, sound, and animation to aid in remembering the katakana characters. Users can also access simple explanations about the Japanese writing system and the characters used in it. The app includes a katakana table that allows users to tap each character to hear how it's pronounced.

The app has been tested on various Android devices, including Samsung Galaxy S5, Sony Xperia Z Ultra, and Asus ZenPhone 2. If you have any questions or suggestions, you can contact the developer at Katakana Memory Hint English is an excellent tool for those who want to learn katakana in a fun and interactive way.