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Duo vs. Viber: What's the Difference?

Edited by Harlon Moss || By Janet White || Published on March 6, 2024
Duo is a video calling app by Google, focusing on simplicity and reliability. Viber is a messaging app offering text, voice, and video calls, known for its additional features like stickers and group chats.

Key Differences

Duo and Viber are both communication apps, but they serve different primary functions and offer unique features. Duo, developed by Google, is primarily a video calling app designed for one-on-one conversations with the aim of delivering high-quality video calls even on low-bandwidth networks. It emphasizes simplicity and reliability, offering an intuitive interface that makes video calling as straightforward as possible. Viber, on the other hand, is a comprehensive messaging app that provides users with a wide range of communication options including text messages, voice calls, and video calls. It is known for its rich feature set, including stickers, group chats, public accounts, and the ability to send media files.
Duo’s standout feature is its 'Knock Knock' function, which allows users to see a live video of the caller before answering the call, offering a unique and engaging way to start conversations. Viber distinguishes itself with its extensive collection of stickers and Viber Out feature, which lets users make international calls to non-Viber users at competitive rates. While Duo focuses on providing a high-quality video calling experience with minimal complexity, Viber aims to be a versatile messaging platform catering to various user needs.
In terms of user base and application, Duo is integrated into many Android devices as a part of Google's communication suite, making it easily accessible for Android users. Viber, originally popular in Eastern Europe, has expanded its reach globally and is used for both personal and business communication. Viber also offers end-to-end encryption for all its communication methods, ensuring users’ privacy and security.
Both Duo and Viber require internet connectivity, but they cater to different audiences and usage scenarios. Duo is ideal for users who want a simple and reliable app for video calls, particularly within the Google ecosystem. Viber, with its broader communication features and emphasis on social interaction through stickers and group chats, caters to users looking for a more feature-rich messaging experience.

Comparison Chart

Primary Function

Video calling
Messaging and calling

Unique Features

'Knock Knock' preview
Stickers, Viber Out

User Interface

Simple and intuitive
Feature-rich and customizable

Communication Methods

Video calls
Text, voice, and video calls

Target Audience

Users seeking simplicity in video calling
Users looking for comprehensive messaging features

Duo and Viber Definitions


Known for simplicity and reliability.
Duo works smoothly even on my old smartphone.


Offers stickers and media sharing.
I love sending funny stickers on Viber.


Focuses on one-on-one video calls.
Our family prefers Duo for its high-quality video calls.


Provides end-to-end encryption for privacy.
Knowing that our conversations are secure with Viber's encryption gives me peace of mind.


A Google video calling app.
I used Duo to catch up with my friend overseas.


Features group chats and public accounts.
I follow my favorite band through their Viber public account.


Part of Google's communication suite.
Duo integrates seamlessly with my other Google apps.


A messaging app with various communication options.
We use Viber for our family group chat.


Features 'Knock Knock' live video preview.
Seeing my brother's face before answering through Duo's Knock Knock feature always makes me smile.


Allows international calls with Viber Out.
I called my grandma in Italy using Viber Out.


(Music) A duet, especially two performers singing or playing together.


Two people or two things in close association
A duo of negotiators.


Does Duo support group calls?

Yes, Duo supports group video calls with up to 32 participants.

How does Duo handle poor network conditions?

Duo automatically adjusts video quality to maintain the call over poor network conditions.

Is Duo free to use?

Yes, Duo is free to use, though data charges may apply if you're not connected to Wi-Fi.

How does Duo ensure privacy?

Duo calls are end-to-end encrypted, ensuring that calls are private and secure.

Can I send messages on Duo?

Duo primarily focuses on video and voice calls, but it allows you to send video and voice messages.

What is Duo?

Duo is a video and audio calling app developed by Google that focuses on simplicity and reliability, available on both Android and iOS devices.

Can Duo calls be made over both Wi-Fi and mobile data?

Yes, Duo calls can be made over Wi-Fi or your mobile data connection.

Can I block contacts on Duo?

Yes, you can block specific contacts on Duo to prevent them from calling you.

Is Viber free?

Viber is free for basic messaging and calls to other Viber users, but it offers Viber Out, a paid service for calling non-Viber numbers.

Do both parties need the Duo app to communicate?

Yes, both the caller and the receiver need to have the Duo app installed and set up.

Can I delete messages on Viber after sending them?

Yes, Viber allows you to delete messages after sending them, both for yourself and for the recipient.

Can I use Duo on a computer?

Yes, Duo can be used on computers by accessing the web version via Google Chrome or other web browsers.

Can Viber be used on multiple devices?

Yes, Viber can be synchronized across multiple devices, including smartphones, tablets, and computers.

Can I make international calls with Viber?

Yes, you can make international calls to other Viber users for free or use Viber Out to call non-Viber numbers at competitive rates.

Does Viber support group chats?

Yes, Viber allows for group chats with up to 250 participants.

How can I start using Viber?

To use Viber, download the app, register with your phone number, and verify it to start messaging or calling.

What is Viber?

Viber is a cross-platform messaging and VoIP (Voice over Internet Protocol) app that allows users to make free voice and video calls, send texts, and share media.

How does Viber handle low-quality internet connections?

Viber adjusts call quality to optimize performance under varying internet conditions.

How does Viber ensure user privacy?

Viber uses end-to-end encryption for all messages, calls, and shared media between users on the platform.

Does Viber offer any entertainment features?

Yes, Viber offers stickers, GIFs, and Viber Games to enhance user interaction.
About Author
Written by
Janet White
Janet White has been an esteemed writer and blogger for Difference Wiki. Holding a Master's degree in Science and Medical Journalism from the prestigious Boston University, she has consistently demonstrated her expertise and passion for her field. When she's not immersed in her work, Janet relishes her time exercising, delving into a good book, and cherishing moments with friends and family.
Edited by
Harlon Moss
Harlon is a seasoned quality moderator and accomplished content writer for Difference Wiki. An alumnus of the prestigious University of California, he earned his degree in Computer Science. Leveraging his academic background, Harlon brings a meticulous and informed perspective to his work, ensuring content accuracy and excellence.

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