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A comment on You know, Google, the web already had this feature. Parent comment

Re:You know, Google, the web already had this feature by jeremyjh on Friday April 12, 2013 @10:33AM (#5538678)
I spent two hours with my wife's iPhone trying to figure out which app was burning all her juice. On my android it takes just a few seconds since I can run a task manager that actually reports CPU utilization. From what I can tell, that is completely forbidden on iOS. Still, her phone does not "just work".
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Re:You know, Google, the web already had this feature by moogleii on Friday April 12, 2013 @04:46PM (#5540898)
Mine seems to. Shrug There's always a counter-anecdote somewhere, I guess.

Back when the iPhone 4 was new, my friend had some kind of HTC Android, and he would beam about how he could run a tool that would help him micromanage battery power so that he could shut off this app versus that app (which he had to do quite often). I simply never had to. As Anandtech can back up, the iPhone 4 had amazing battery life compared to its contemporaries. Though more anecdotal evidence seems to show that newer iOS devices consume more power.

Anyway, for reference, Settings > Privacy > Location Services. You can see what is actively using GPS. As part of its low-power design efforts, other than music, there really isn't much else that the OS will allow to run in the background. All other closed apps are frozen in a saved state. Also, Settings > Privacy > Location Services > System Services, at the bottom, Status Bar Icon.

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