The app works with wireless charging also. Just put your phone on the wireless charging pad at night and the vibration will tell you that its put correctly and charging is started.
Connect your charger in dark and get notified about charging started without switching on the screen.
Your cable is loose? Get notified that charging is disconnected by the vibration.
App vibrates when charging starts. Useful for someone who uses mobile cover and cannot see the notification light about charging started. Or for people who have migrated from IPhone and are habitual of phone vibrating when USB is connected to power.
Edit: we have come to know that even after the fix, the app is not working on some devices of OS version 8 and 9. This is a known issue and we are working on resolving the same. However the app is working fine on all devices of OS version 7 and below.