The app is completely secure for downloading. Playerum is the creator of JDD that can be found in the Education Games category. The game has been downloaded and installed by over 5K users and the latest update was released on Sep 4, 2019.
This application has been rated 3.7 on Google Play. It's free to download the installer of JDD, also, you can have a look at users' reviews on Droid Informer. The app runs on Android 4.1 and above.