Using Greyscale Mode on iOS to Improve Battery Life
I, like many other smartphone users, get really frustrated over how limited batteries in mobile devices can be. Recently I've been using my iPhone in greyscale mode to try and combat this. This is purely anecdotal, and not a scientific test at all, but after activating greyscale mode my iPhone gets better battery life.
Just go into the Settings app > General > Accessibilty, and toggle greyscale mode on.
Other benefits of using greyscale mode include looking super minimal to anyone peeking at your phone, and having a 100% black and wide Instagram feed!