Sensor Tower

Sensor Tower is a mobile application data and analytics platform. Per a 2023 FreeS Fund piece, it publishes market-intelligence reports such as the *2023 Health and Fitness App Market Insights*, which tracked global download trends for fitness apps during and after the COVID-19 pandemic . The platform is also cited for tracking AI-application monetization: a 2024 FreeS Fund report noted Sensor Tower's forecast that global AI mobile-app paid revenue would reach $3 billion for the full year, with image and video tools accounting for 53% of that total . More recently, in March 2026, a16z partner Olivia Moore circulated a Sensor Tower screenshot showing that OpenAI's Sora had a 30-day user-retention rate of just 1% and a 60-day retention of zero, underscoring the platform's use by investors for competitive intelligence . An elsewhere report from May 2026 described it as "the world's most well-known mobile application data platform," noting that a VC-authored due-diligence report on an AI startup drew on Sensor Tower figures alongside proprietary scraping tools .