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The Android OS monitors the power consumption of running apps and hardware (display). As you may guess, this is a useful feature as it allows to track down energy greedy apps.

Is there an application that would do such monitoring on Mac OS?

It should calculate the percentages of the charge that an application/process/hardware has used.

I use plenty of little software that runs in the background permanently. It would be nice to know if such little helpers drain the battery significantly.

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spoiler alert: high cpu or I/O usage apps use more power.. it should be obvious where the clear energy drainers are –  XAleXOwnZX Jan 4 '12 at 17:17
    
That's not the point. I don't usually run high CPU or I/O tasks. Instead, I do have lots of little programs installed that only show up in the menubar (growl, equalizer, dropbox, bettersnaptool,...). It would be nice to know if such little helpers drain the battery by a significant amount. –  gentmatt Jan 4 '12 at 17:31
    
Seems like a pointless endeavour to be honest, since if you find them to be useful, it might be worth sacrificing the minute or so they lower ur battery life by –  XAleXOwnZX Jan 4 '12 at 19:47
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2 Answers

up vote 7 down vote accepted

As of Mavericks, this is provided by the OS. Activity monitor has a tab devoted to displaying the energy use of running (and recently running) apps.

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The Battery menu extra in Mavericks will also display the apps using the most energy. –  da4 Nov 15 '13 at 16:59
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iStat Menus

let's you monitor your current computer power usage. Unfortunately, it does not break it down by app.

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I know - as you said this is not sufficient. It is also proprietary. That's why I'm using the iStat Pro widget. –  gentmatt Jan 4 '12 at 9:44
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