The Purdue study found that switching from light mode to dark mode at 100% brightness saves an average of 39%-47% battery power.

Does dark mode actually save battery?

Surprisingly enough, findings from the study reveal that dark mode is unlikely to impact the battery life of a smartphone significantly. Though it does use less battery than a regular light-coloured theme, the difference is unlikely to be noticeable “with the way that most people use their phones on a daily basis. “

Does iPhone 12 dark save battery?

Switch to the dark side

So while you’re operating a dark-themed app on your phone, the display turns off the black pixels and consumes less power than it would on a lighter theme. Sticking to your iPhone’s dark mode, therefore, can save you at least an hour of charge every day.