WhatsApp
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Viber
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Founded in 2009 by Brian Acton and Jan Koum, both former employees of Yahoo!
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Founded by Israeli and Belarusian partners Talmon Marco, Igor Magazinnik, Sani Maroli and Ofer Smocha, with Marco as its CEO.
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Owned by Facebook Inc.
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Owned by Viber Media.
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WhatsApp is available for smartphones (Windows Phone, Android, Symbian, iOS, Blackberry OS, and Tizen), and can also be accessed on the web.
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Viber is available for desktop(Windows, OS X, Unix-like, Bada, and Linux), smartphones (Windows Phone, Android, Symbian, iOS, and Blackberry OS), but cannot be accessed on the web.
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There is a subscription free for WhatsApp of $1 after one year.
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Viber is free without any subscription. However, Viber provides premium icons for users, which have to be paid for.
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WhatsApp is built on the Erlang programming language.
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Written in C/C++/Python (desktop, using SIP and Qt frameworks), Objective-C (iOS), and Java (Android).
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Available in 32 Languages.
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Available in 30 languages.
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WhatsApp's user base is more.
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Viber has less users compared to WhatsApp.
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