They both use VOIP (Voice Over Internet Protocol) which, makes calling accessible through the internet. Because they have their functions and lack in their way. So, it can be concluded that both Viber and Tango are good at their levels. As a result, it allows users to use a range of languages which makes it suitable to interact with people worldwide.

In terms of languages, Viber supports more languages than Tango.Viber does not allow users to play interactive games between the users but in Tango interactive games are available which can be played between the users.

This is because Viber uses end-to-end encryption which protects the data of parties who are communicating and makes the unencrypted information access to the intended receiver only. Due to social networking features, engagement among creators and followers increases by commenting, sharing, and tagging.

Viber does not support social networking whereas, Tango does.

On the flip side, Tango offers both video calls (face-to-face calling) and voice calls.

Viber application supports only free SMS texts and voice calls.

Viber call and message