Launched four months after Whatsapp (December 2010, to be precise), Viber is one the best option if you aim to switch to a messaging platform with a large user base – chances of your existing contacts being on this platform already are very high! This app has every feature that Whatsapp, with the added feature of being able to use your cellular data to make audio calls to anyone in your contact list. Along with cool features like group chatting and cool stickers, the app also has a feature that allows you to seamlessly move from a text conversation to a phone call on the same screen, which can really come in handy with friends and acquaintances living out of the country.
Who owns it? Viber is owned by Rakuten, the Japanese e-commerce giant.
Users: Over 100 million monthly active users