Get the installer of Defter TUBE 1.0.5 that is provided for free and take a look at users' reviews on Droid Informer. The app is built for Android 4.1 and above. It's safe to download this application. Markalar Birliği created the tool that falls into the Educational category.
Defter TUBE was downloaded and set up by over 10K users and the latest stable release was on Nov 14, 2016. Google Play shows that the app is rated 3.2 by its users.