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Google Duo: How does it compare to WhatsApp, Skype, and other rivals?

Sometimes less is more!

Published onJuly 19, 2022

Google Duo stock photo 4
Edgar Cervantes / Android Authority

Messaging and video calling apps are a dime a dozen these days. One of the more popular ones is Google Duo, which lets you stay in contact with friends and family from anywhere. But how does it compare with rivals like WhatsApp, Viber, Skype, and Signal? Should you use it? We’ll work to answer both questions over the course of this page.

Google Duo vs the competition

Google Duo - best VOIP apps and SIP apps
Edgar Cervantes / Android Authority

The main thing you should know is that Google Duo doesn’t support instant messaging. It only supports audio and video calls. This is the most significant difference between Google Duo and other popular rival apps. WhatsApp, Signal, Skype, Messenger, and Viber all allow you to send messages in addition to making calls.

Google had a dedicated messaging app called Allo for a few years. It debuted alongside Duo in 2016, but the company killed Allo last year due to its limited user base. Hangouts is also discontinued and replaced with Google Chat. But at least you can still use the latter for messaging.

Google Duo has a few features you won’t find in most of its competitors regarding calls, though. The most interesting one is called Knock Knock, and it lets you preview video calls. That means when someone calls you, you can see the person through their camera before you answer the call. For security reasons, the person calling can’t see you until you pick up.

If no one answers, you can leave a video message.

Then there’s the ability to create a video/audio message and send it to a contact. Yes, WhatsApp and other rival apps let you send audio recordings and video clips via chat. Duo implements this differently. It’s a bigger, more important part of the app. For example, if you’re calling someone and that person doesn’t answer, you can press the Leave a message button and then decide whether you want to leave an audio or video message. Like my colleague Ankit did in the screenshots below, you can also spice up a video using various filters and effects.

Google Duo also lets you send a heart emoji to contacts with a single tap or a simple note that can be customized with different fonts and colors. These are not groundbreaking features by any means, but they are fun and convenient. The tool is also integrated into the dialer app on Samsung Galaxy S21 phones, allowing you to quickly call someone with the tap of a button.

Another thing worth mentioning is that Google Duo is ad-free. It’s not the only app of its kind without ads, but it’s definitely in the minority. Signal is also ad-free. Meanwhile, Skype, Viber, and Messenger all contain ads. There are no ads on WhatsApp now, but news of ads coming has circulated for a while.

When it comes to group calls, Google Duo used to allow up to 12 people to join in on the fun. That number has increased to 32 since 2020. This isn’t class-leading, but it competes well. Viber supports up to 30 people, while WhatsApp allows for eight. Skype is the most generous with its support for up to 100 people.

Call quality

Google Duo Stock photo 4
Edgar Cervantes / Android Authority

Excellent features don’t matter if the call quality is terrible. This is where Duo should shine because Google says it’s “the highest quality video calling app” you can get. We decided to put this to the test. I made video calls with Google Duo, Viber, Skype, Signal, and WhatsApp to see how big a difference there is.

Also: Hangouts vs. Skype

Based on my testing, Google Duo lives up to its promise. Its video quality is better than Viber, Signal, and WhatsApp. The colors are more vibrant and realistic too. The video is less grainy, and the connection is much more stable, reducing freezes.

I’m not saying that Viber, Signal, and WhatsApp are bad apps for video calling. They get the job done, but the difference in video quality compared to Duo is immediately noticeable. Skype, on the other hand, is just as good as Google Duo. I didn’t see a significant difference between the two — both get a thumbs up from me.


Phone showing encryption settings 3
Edgar Cervantes / Android Authority

Privacy is essential, so we must say a few words about encryption. Google Duo offers end-to-end encryption, which basically means that no one can see the messages you send or the calls you make. That includes Google.

End-to-end encryption is great, as it provides total anonymity. However, Google Duo isn’t the only service offering it. Viber, WhatsApp, and Signal all have it on by default, making them just as safe as Google Duo.

Read next: Not sold on Zoom? Here are the eight best alternatives to consider

When it comes to Skype and Facebook Messenger, the story is a bit different. By default, both encrypt the data between your device and the companies’ servers. This means that while no one can snoop on your conversation if you’re on public Wi-Fi, both Microsoft (Skype’s owner) and Facebook can see the messages you send if they want to. Facebook has committed to introducing end-to-end encryption, but that won’t happen soon.

There’s a way to get around this, though. Both Skype and Messenger kind of offer end-to-end encryption already. You have to enable it yourself by opening a Private conversation on Skype or a Secret conversation on Facebook. This means that the two services can be as safe as Google Duo, WhatsApp, and the rest of the competition, given you know what to do. It’s a bit of a pain, but it’s better than nothing.

So, should you use Google Duo?

Samsung Galaxy Z Flip Duo call top half
David Imel / Android Authority

Google Duo is a mixed bag. The lack of instant messaging makes it hard to recommend to those looking for an all-in-one communication app. On the other hand, video quality makes it an excellent choice for frequently making video calls.

If video quality is super important to you and you’re not already using Skype, I’d say definitely give Google Duo a shot. It also comes with a few unique features many will enjoy, even if there’s nothing groundbreaking about them. Not to mention it’s a Google app and works with the same Google account you already use.

Next: How to use Google Hangouts

If you’re happy with your current messaging app’s video quality or want one app that can handle both messaging and calls, then Duo isn’t for you. The video quality on apps like WhatsApp and Viber is decent, but it isn’t on par with what Duo offers.

Another great benefit is that Google Duo now offers video calls with up to 32 participants, a helpful feature. Only Skype can beat it with its 100 participant limit.

The great thing about these apps is that they are all free, so you can test them yourself to get some hands-on experience. You can download Google Duo below if you don’t already have it installed on your phone and try it out.

This goes without saying, but I’ll say it anyway: When choosing the right messaging app for your needs, you also have to consider which ones your friends are using. A great app is useless if no one you know uses it, as you won’t have anyone to talk to.


Google Duo is free and has no ads. That’s what makes it such a compelling service.

Google Duo works with your Google account. Most of you probably already have one, so you’ll just need to launch the app and log in.

Google Duo supports video calls with up to 32 participants.

Google Duo video calls are streamed at 720p.

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