The download of this application is 100% safe. Math Academy Ltd is the official developer of the app that can be found in the Educational category. Tiếng Nhật phổ thông was downloaded and set up by over 1K users and its latest stable release was on Oct 21, 2016.
Google Play shows that the tool is rated 3.7 by its users. There are ads in this application. It's free of charge to download the installer of Tiếng Nhật phổ thông, also, you can check out users' reviews on Droid Informer. The app works fine on Android 2.3 and above.