This is the first release of the application which support the study of JLPT(Japanese Language Proficiency Test) N4 level Japanese language.
The concept and the structure of this SmartJ4 application is completely the same as SmartJ5 which has already released and on the market.
Only the difference is the level of the contents, because this SmartJ4 application is for JLPT N4 level learners and SmartJ5 application is for JLPT N5 level learners.