Doze works in a similar regard except it isolates apps from accessing the Internet in the background, again this leads to improved standby time.What about doze is that any good?
The reason these apps leads to increased battery life for some is that battery that was previously lost in standby is now used up during active use and thus screen on time is improved. If you lose 20% for an hour of screen on time and with Greenify/Doze you end up with an extra 10% battery after your work day then you have essentially gained 30 minutes of screen on time which you previously would have lost. Of course, these numbers are hypothetical and your results will vary greatly, in my case I don't use any of those apps as I find Doze didn't provide a noticeable improvement while Greenify annoyed me since it would flash the screen to turn off apps in the background.
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