A grayscale mode is an option which is officially available to very limited devices. But it is still there on others. It is quite useful for reading any kind of e-books or articles online as it puts less strain on your eyes and also does some wonders by saving a bit of your phone's battery. So today, I'm gonna show you how to enable it. Go to Settings > About Phone and tap on the ' Build Number ' seven times in rapid succession. Then a toast message will appear telling, 'You are now a developer' (Means now you have access to the developer settings). Now go to Settings and deep down you'll see ' Developer Options '. Select it and scroll down to the button and find the ' Hardware Acceleration Rendering ' option close to the bottom of the section. At the bottom of the ' Hardware Acceleration Rendering ', select ' Stimulate Colour Space ' option. Then, choose the ' Monochmacy ' option from the popup. Your sc