Black and white filter

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Hi
My friends iphone runs on ios 8.3 and he uses the grey filter option from the settings. This makes his iphone screen completely black and white. This helps save a heck lot of battery. Is there any way I can do this using some kind of app on my moto e 2015 running android 5.0.2 BTW I already know about the simulate color space option in developer options, this is perfect but the only problem is that it causes a lot of load on the device and uses even more battery. It also make is horribly laggy.
All responses are appreciated

Thanks

Root your phone, hibernate user apps using greenify and remove unwanted apps from startup.

There goes away your battery woes.

Also check which apps are causing too many wakelocks and use their alternatives with minimal or no wakelocks.

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Thanks a lot