AppTo is a social app discovery platform that allows users to see what apps their friends are using, what's trending, and get recommendations. It uses a privacy-focused algorithm to show statistical data on apps' popularity among a user's friends without explicitly showing who has which app. Users can also share their favorite apps, discuss apps with friends, and get notifications on new app activity. The service aims to provide a better way to discover apps than top lists or alternative app markets through social recommendations and automated scans of social media discussions.