• In your Android Display system setting, set your device to dark theme—Gmail will automatically respect the system default setting.
  • On Pixel, when Battery Saver is enabled, Gmail will default to dark theme automatically.
  • Or, in Gmail go to Settings > Theme and select “Dark".

On iOS things are slightly different with Google recommending the following:

  • For iOS 11 or 12, enable dark theme by going to Settings > Dark Theme.
  • To enable dark theme on iOS 13, you can:
  • Set your device to dark theme in iOS Settings, and Gmail, by default, will automatically respect the system default setting.
  • Or, in Gmail go to Settings > Theme and select “Dark”.

Dark modes in general can be a little overhyped in their importance, but some people prefer the darker hues particularly at night. Also if you have a phone with an OLED display then it’ll save you battery life as it lights up fewer pixels then white-backed apps.

It continues Google’s slow rollout of dark mode across its apps and services – not every Google thing is dark right now and Gmail was one of the few remaining apps to get it.