Educa Studio is the developer of this application that can be found in the Educational category. Over 100K users downloaded and installed the app and the most recent update was on Aug 27, 2015. Google Play shows that Marbel Belajar Grammar is rated 4.5 by its users.
Advertisements are a part of the tool. This application is often downloaded by Samsung and Lenovo users. It's free to get the installation package of Marbel Belajar Grammar, also, you can have a look at users' reviews on Droid Informer. The app works fine on Android 2.3 and above.
The download of the app doesn't contain viruses or any kind of malware.