Luglasoft is the official developer of Fiszki which can be found in the Educational category. The tool was downloaded and installed by over 5K users and the latest stable update was on Oct 12, 2015. Users rated this application 4.3 on Google Play.
There are adverts in the app. It's free of charge to get the .apk setup package of Fiszki and you can read users' reviews on Droid Informer. This application installer requires 2 MB of free space to run on Android 2.3.3 and higher. According to the antivirus report, the app doesn't contain viruses or any kind of malware.