OpenSignal is the world's largest crowdsourced mobile sensor network. With over 6 million downloads, 1 million active users and billions of unique data samples gathered per day, the OpenSignal application provides wireless market insights to major customers such as McKinsey, Opera, Telefonica and ChinaMobile. The same dataset helps users of the app find better signal in realtime and locate free WiFi hotspots in any city worldwide.
OpenSignal's second application, WeatherSignal, uses pressure, temperature and humidity sensors on smartphones to collect data to provide better weather prediction to over 50k users, already inline with the largest weather station networks. OpenSignal has published a scientific paper with the Royal Meteorlogical Society of the Netherlands demonstrating the potential of crowdsourced data for improving short term weather forecasts.