In this Viber review, we’ll take a look at its functionality and features. It is presently owned by Japanese company, Rakuten. Established in 2010, the app has steadily grown in popularity. It helps users connect with each other, make calls and send instant messages, pictures and videos.īehind only WhatsApp and Skype, Viber commands the third largest market share in the instant messaging space. Viber is an instant messaging and VoIP tool used by close to a billion people around the world.