You are able to get the installer of Tierelier 3.0 for free and check out users' reviews on Droid Informer. The app requires Android 2.3.3 and above. The download of this application doesn't contain viruses or any kind of malware. Muldata is the official developer of the tool which can be found in the Educational category.
Tierelier was downloaded and installed by over 100 users and the latest stable update was on May 29, 2018.