Google Duo

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Google Duo
Google Duo icon.svg
Google Duo.png
A screenshot of Duo
Developer(s)Google LLC
Initial releaseAugust 16, 2016; 5 years ago (2016-08-16)
Stable release(s) [±]
Android116.0 / May 23, 2022; 40 days ago (2022-05-23)[1]
iOS114.0 / November 20, 2020; 19 months ago (2020-11-20)
Operating system
Available inEnglish
TypeVideo chat mobile app

Google Duo is a video chat mobile app developed by Google, available on the Android and iOS operating systems. It was announced at Google's developer conference on May 18, 2016, and began its worldwide release on August 16, 2016. It is also available to use via web browser on desktop and laptop computers.[2]

Google Duo lets users make video calls in high definition. It is optimized for low-bandwidth networks. End-to-end encryption is enabled by default. Duo is based on phone numbers, allowing users to call someone from their contact list. The app automatically switches between Wi-Fi and cellular networks. A "Knock Knock" feature lets users see a live preview of the caller before answering. An update in April 2017 lets users worldwide make audio-only calls.

The app is set to be replaced by Google Meet in 2022.


In December 2016, Google Duo replaced Hangouts within the suite of Google apps device manufacturers must install in order to gain access to the Google Play Store, with Hangouts instead becoming optional.[3]

In August 2020, it was reported that Google was planning to eventually merge Google Duo with the business-oriented Google Meet.[4] In December 2021 this objective had been dropped, but Duo continued to be available and updated.[5][1] In June 2022, Google reversed course and announced that Duo would, in fact, be merged into Meet. The mobile app will be rebranded as "Google Meet", while the original Meet app will eventually be deprecated.[6]


Google Duo video calls are in 720p HD video.[7] It is optimized for low-bandwidth mobile networks through WebRTC and uses QUIC over UDP. Optimization is further achieved through the degradation of video quality through monitoring network quality.[8] "Knock Knock" shows a live preview of the caller before the recipient picks up, which Google says is to "make calls feel more like an invitation rather than an interruption".[9] End-to-end encryption is enabled by default.[7] Duo is based on phone numbers, allowing users to call people from their contact list.[7] The app automatically switches between Wi-Fi and cellular networks.[7] For packet loss concealment Duo uses WaveNetEQ, a generative model based on DeepMind/Google AI’s WaveRNN.[10]

In March 2017, it was announced that Google Duo would let users make audio-only calls. The feature was first launched in Brazil,[11][12][13] with a global rollout in April.[14]

A year later in March 2018, video and voice messages were added to Duo. Users can leave messages up to 30 seconds long for contacts who are unavailable.[15]

Support for eight-person video calls in both the iOS and Android versions of the app was added in May 2019.[16] In line with similar group calling offerings from FaceTime, WhatsApp, Skype and Facebook Messenger, participants can join or leave the conversation at any time. Google Duo increased maximum group size to twelve at the end of March 2020,[17][18] and to 32 by May 2022.[1]

See also[edit]


  1. ^ a b c "Google Duo". Google Play. Retrieved May 25, 2022. App updated 23 May 2022
  2. ^ "Set up Google Duo - Computer - Google Duo Help".
  3. ^ Ruddock, David (October 7, 2016). "Google is demoting Hangouts to "optional" in the Google Apps package for Android, to be replaced by Duo". Android Police. Retrieved October 20, 2016.
  4. ^ Lee, Abner (August 14, 2020). "Sources: Google plans to eventually replace Duo with Meet". 9to5Google. Archived from the original on August 15, 2021. Retrieved October 22, 2016.
  5. ^ Li, Abner (December 16, 2021). "Scoop: Google Duo development & planned consumer-focused merger with Meet fizzles out". 9to5Google. Archived from the original on December 16, 2021. Retrieved December 21, 2021.
  6. ^ Pierce, David (June 1, 2022). "Google is combining Meet and Duo into a single app for voice and video calls". The Verge. Archived from the original on June 1, 2022. Retrieved June 1, 2022.
  7. ^ a b c d Fulay, Amit; Adan, Yariv (May 18, 2016). "Saying 👋 to Allo and Duo: new apps for smart messaging and video calling". The Keyword Google Blog. Retrieved January 9, 2017.
  8. ^ Bohn, Dieter (May 18, 2016). "Google Duo makes mobile video calls fast and simple". The Verge. Vox Media. Retrieved October 21, 2016.
  9. ^ Uberti, Justin (August 16, 2016). "Meet Google Duo, a simple 1-to-1 video calling app for everyone". The Keyword Google Blog. Retrieved January 9, 2017.
  10. ^ "Improving Audio Quality in Duo with WaveNetEQ". Google AI Blog. Retrieved April 1, 2020.
  11. ^ Queiroz, Mario (March 22, 2017). "Google for Brazil: Building a more inclusive internet for everyone, everywhere". The Keyword Google Blog. Retrieved March 22, 2017.
  12. ^ Erlick, Nikki (March 22, 2017). "Google announces app updates to Allo, Duo, and Photos". The Verge. Vox Media. Retrieved March 22, 2017.
  13. ^ Palmer, Jordan (March 22, 2017). "Google Duo is finally getting an audio-only call option, rolling out first in Brazil [APK Download] and have". Android Police. Retrieved March 23, 2017.
  14. ^ Vincent, James (April 10, 2017). "Google Duo's voice calls are now available worldwide". The Verge. Vox Media. Retrieved April 10, 2017.
  15. ^ Lindsay, Dave (March 7, 2018). "Miss a call—but not the moment—with video messages on Google Duo". The Keyword Google Blog. Retrieved March 15, 2018.
  16. ^ @juberti (May 23, 2019). "#GoogleDuo group calling is now fully deployed, with the simplicity, quality, and security you expect from Duo" (Tweet) – via Twitter.
  17. ^ "Google Duo brings group calling with up to 32 people to web and adds family mode". Zee Entertainment. May 11, 2020. Retrieved May 12, 2020.
  18. ^ Vigliarolo, Brandon (May 12, 2020). "Google steps up Zoom competition by adding 32-person calls to Duo". TechRepublic. Retrieved May 15, 2020.

External links[edit]