The most popular free apps for iOS are Acapella from PicPlayPost, Facebook Messenger, Rop and Instagram as of November 2015. On Android, the most popular free apps are Facebook Messenger, Facebook, Pandora Radio and Snapchat.
Acapella from PicPlayPost allows musicians to create acapella videos easily. Rop is a minimalist puzzle game that challenges players to rearrange connected blocks to recreate patterns. Instagram is a social network based on sharing photos with friends.
Facebook is one of the largest social networks in the world built on helping friends stay in touch, while Facebook Messenger is a standalone messenger app for chatting with Facebook friends. Pandora Radio is a music streaming app that lets users listen to customizable radio stations. Snapchat is a photo and video chat application that automatically deletes messages a few seconds after they are viewed.