isOnline Hangouts? is a free Android app developed by Lorenzo Braghetto, falling under the category of Utilities & Tools. The program allows you to check if your Hangouts contact is online from their PC, mobile device, or offline. With the old XMPP connection, it is still possible to know if someone is online and what app they are using. Unfortunately, the app cannot determine if a contact is online or offline from their mobile device. It is important to note that this is not a chat client and no personal data is collected using this application. The source code is available on GitHub under the GPLv3 license. Lastly, it is not affiliated with Google.

The app's main function is to check if your Hangouts contact is online, and it does so effectively. With its simple interface, the app is easy to use and navigate. However, it is limited in its ability to determine a contact's online status only from their PC or mobile device. The app cannot determine if a contact is online or offline from their mobile device, which can be a drawback for some users. Overall, isOnline Hangouts? is a useful app for those who want to check their Hangouts contact's online status from their PC or mobile device.