WattMate , also on the App Store

About WattMate

Watts per app, not a nameless score. Then a receipt: promised 24 min, got 28 min.

Features

• Every app's power use in watts, updated live, with the heaviest at the top.
• With Pro: how much battery life you would get back by quitting an app, in minutes.
• A notification when an app keeps using more power.
• Works on battery and on the charger.
• Battery health: the capacity your battery holds now against its design capacity, in mAh and as a percentage.
• Cycle count, against the cycles Apple designed the battery for.