1. 谷歌环聊：
Google Hangouts 是由 Google 提供的通讯应用程序。它允许用户发送和接收消息、照片等。它还提供个人之间或组内的免费视频通话。它最初是 Google+ 的一个功能，但 Google 将 Google+ Messenger 和 Google Talk 的功能集成到环聊中。它由 Google 于 2013 年推出。它使用户能够与朋友和家人联系并开始对话。此应用程序可以通过 Gmail 在线访问。
2. 谷歌二重奏：
Google Duo 是一款适用于 Android 和 iOS 操作系统的视频通话移动应用程序。它也可以通过个人计算机上的 Chrome 网络浏览器使用。它使用户能够获得高质量的视频通话服务。它以这样一种方式开发，即使 id 用户的互联网服务速度很慢，它也能正常工作。端到端加密可实现高安全性。它还支持群组视频通话。早些时候它的组大小为 8，但后来扩展到 12。它由 Google LLC 推出。它于2016年推出。
Google Hangouts 和 Google Duo 的区别：
| GOOGLE HANGOUTS | GOOGLE DUO |
|---|---|
| It is a communication application that is used to send and receive messages, photos etc. | It is a video chat application that provides video calling services. |
| It was launched in 2013. | It was launched in 2016. |
| It offers messaging, voice calls and video calls. | It offers voice calls and video calls. |
| It offers text messaging. | It recently added service for recorded messaging but does not offer text messaging. |
| It is mainly used for text messaging and photo sharing. | It is mainly used for making video calls. |
| It is original feature of Google+. | It is original feature of Google. |
| It does not allow users the blocking of unwanted calls. | It allows users the blocking of unwanted calls. |
| It has less number of users. | It has comparatively more number of users. |
| It does not provide full control of call making. | It gives full control of the call making through the phone devices. |
| Only 2 people can be involved in calls. | Up to 12 people can be involved in calls. |
| It is integration of Google+ Messenger and Google Talks. | It is not integration of two or more applications. |