OpenSignal offers a free app that tests mobile and WiFi speeds, compares coverage across different operators, and maps out WiFi hotspots globally. With over 20 million downloads, OpenSignal has built the largest global database on mobile performance. The company uses crowd-sourced data from its users to increase transparency in the wireless industry by publishing reports on network quality and offering unbiased coverage maps. OpenSignal's analytics products are used by mobile network operators, telecom equity analysts, and regulators to improve network connectivity.