A free app for Android, by Tawkto.

Tawk.to is a free chat app for websites. It lets you watch people online and chat with them. The app has an intuitive design and is easy to use, so even people with no knowledge of web technology can start using it.

The main purpose of the app is to help website owners to keep their website online and to have a way to talk to their visitors. It works as an extension on top of your website and lets you add an unlimited number of people to your site. With the app, you can monitor and chat with your visitors, regardless of the site you are on to and this is completely free.