StarLeaf supports notifications (such as sounds, banners, and app badges) across all devices (Windows, Mac, iOS, Android). On mobile devices StarLeaf supports push notifications and these are configurable through the device settings. For example, on the iPhone, these settings look like this:

 

You can also mute notifications on a per-contact or per-group basis and then your device will not sound when you receive a new message from that contact or group. To mute a contact or group, go to the info page for that contact or group and choose Mute contact. On an Android device, this looks like this:

Mac

On a Mac, you configure StarLeaf push notifications through the Notification Center.

Windows

On a Windows computer, to configure system notifications, go to Windows Settings > System > Notifications and actions.