Japanese writing system is a combination of character types, Kanji and Kana.
Kana itself consists of Hiragana (native Japanese words) and Katakana (used for foreign words and names).

This application contains the Kana system of Japanese Alphabet. The basic hiragana and katakana.

It is good for everyone and very easy to use everywhere.
As long as you are passionate to learn Japanese, this app is an effective learning tool.