WhatsApp

WhatsApp Messenger, or simply WhatsApp, is an American freeware, cross-platform centralized messaging and voice-over-IP service owned by Facebook, Inc. Its messaging app that lets users text, chat, and share media, including voice messages and video, with individuals or groups. Jan Koum got the idea for $19 billion WhatsApp after missing too many iPhone calls at the gym. He wanted to build an app that shows statuses next to the individual names of the users. Koum discussed the idea with Acton and both started visiting Alex Fishman for more insights. But executing this idea was impossible without the help of an iOS developer. It also has a chinese version, WeChat. Created by a different company.