GSM Spy Finder is described as 'Simple and reliable program to detect activity of GSM Monitoring System equipment designed for active and passive interception of voice and data of any GSM networks. Supports up to 4 GSM bands (850, 900, 1800, 1900), making it applicable anywhere in the world where GSM network' and is an app in the security & privacy category. There are more than 10 alternatives to GSM Spy Finder for a variety of platforms, including Android, F-Droid, Mac, Windows and Linux apps. The best GSM Spy Finder alternative is Atalaya, which is both free and Open Source. Other great apps like GSM Spy Finder are SnoopSnitch, Android IMSI-Catcher Detector, Network Survey and Netmonitor.