Utility app which uses built-in APIs to activate dark mode system-wide which will change the theme for apps which have been updated by their developers to have an automatic dark theme even on older devices! Unlike many others it is completely open source and will never show any ads.

On version 7.0 and above a quick settings tile is also made available which blends in with the rest of your toggles.

Note: some device manufacturers disabled these APIs so this app may not work on your device.