TeslaUnread provides unread count badges for the New Launcher first and WidgetLocker. It will not work with other desktops or lockscreens.
Unread numbers are natively supported for chat and email most popular applications, such as Hangouts, WhatsApp and all the applications shown in the screenshot.
Additionally on Android 4.3 + TeslaUnread can look at the notification bar to extract the read numbers from virtually any application.
For More Info Google Play
Supported Android
varies with device
Download TeslaUnread for Nova Launcher 5.0.8 [Mod Lite] APK For Android