1. 谷歌语音：
Google Voice 是一种电话服务，提供呼叫转移服务和语音邮件服务。它允许用户拥有一个号码并将其转发到多部电话。它由 Google 于 2009 年推出。它适用于 web、android 和 iOS 系统。尽管更改了电话设备，它仍然可以保留电话号码。它使用用户的 Gmail 中的联系人。它提供许多服务，例如语音邮件、免费短信、通话记录、呼叫筛选、阻止不需要的电话以及语音转录到语音邮件消息的文本。
2. 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。
谷歌语音和谷歌环聊的区别：
| GOOGLE VOICE | GOOGLE HANGOUTS |
|---|---|
| It is a telephone service that provides call forwarding and voicemail services. | It is a communication application that is used to send and receive messages, photos etc. |
| It was launched in 2009. | It was launched in 2013. |
| It offers messaging and voice calls but does not offer video calls. | It offers messaging, voice calls and video calls. |
| It is original feature of Google. | It is original feature of Google+. |
| It is a standalone internet based telephony service which uses a single phone number across multiple devices. | It uses a Hangouts dialer application to make phone calls. It does not function alone as a telephony service. |
| It allows users the blocking of unwanted calls. | It does not provide such services. |
| Number used in Google Voice is the regular number used to make traditional phone calls. | It uses WiFi to make phone calls over a WiFi connection. |
| It gives full control of the call making through the phone devices. | It does not provide full control of call making. |
| It is not integration of two or more applications. | It is integration of Google+ Messenger and Google Talks. |
| It does not require to have gmail signing. | It requires gmail signing to connect with people. |