

Other than that, Viber provides Public accounts, channels, bots, and more such socializing features that Signal lacks. Also, you can only add up to 250 participants in a group chat on Viber. But you will have to subscribe to Viber Out which costs around $5.99 per month for free international voice/video calls. Whereas Viber gives free local encrypted voice/video calls. Signal gives free encrypted voice/video local and international calls, and you can add up to 1000 participants in a group chat.

On the other hand, Viber is supported in Android, iOS, Windows, Linux, and old Blackberry or Windows phones, but it does not support on Mac. When platform support is considered, Signal is better as it is currently supported on Android, iOS, Windows, Mac, and Linux running devices. However, Viber on the other hand, collects some metadata, such as your phone number, device ID, etc but it does not share it with third parties which aren’t preferred by the users who give privacy a priority. The Signal messenger app does not collect any metadata or store any backups of your messages. On the other hand, Viber doesn’t do much to protect your metadata.

Signal uses the Sealed Sender encryption feature to secure even your metadata. However, just message encryption doesn’t secure your private data. Hence, we can affirmatively say that both apps provide the best encryption features when it comes to security. When it comes to security both Viber and Signal provide end-to-end encryption for all messages and calls by default.
