PowerLine

The app doesn’t have that many features, but it does come with smart indicators that provide a comprehensive visual representation of various resources and functions on your phone. The most common one is battery status, which is the default indicator inside the app. The remaining battery time on your phone is represented by a blue line at the top of the notification shade.
 
You can add indicators for phone signal, WiFi, unread messages, missed calls, remaining storage, processor, memory, upload or download speed, music volume and many more. The app lets you adjust the position of the indicator, line thickness, edge offset, line color, transparency, width, alignment and many more. It records a history of all indicators inside the app and you can disable indicators at any time.