You'll need a Mac and Xcode to install (but you don't need to be a developer). Instructions video: https://www.youtube.com/watch?v=D_01P4-ubdA https://www.yout

You'll need a Mac and Xcode to install (but you don't need to be a developer). Instructions video: https://www.youtube.com/watch?v=D_01P4-ubdA https://www.youtube.com/watch?v=D_01P4-ubdA If you get weird blue and yellow circles, => turn OFF 'Reduce White Point' in Settings / General / Accessibility / Increase Contrast Note: it works because you don't need to be a developer to load apps to your iPhone via Xcode anymore Note2: it uses "private" APIs so it won't be accepted into the App Store (just like f.lux).