Several Samsung phones have a feature that turns the screen black and white when the battery is getting low. This takes advantage of the AMOLED display in these devices, because unlike red, green, and blue pixels, no battery power is used to display black pixels on this type of screen.

So if you own a device with an AMOLED display, these same principals hold true—although your phone or tablet probably doesn’t have Samsung’s grayscale mode feature.

This is why developer Suyash Srijan created an app to bring this battery-saving feature to all devices. It works at the GPU level, so there aren’t… more

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