Light and dark mode

Metir ships both a light and a dark theme. Light is the default, so if you have never touched the setting, that is what you have.

The three choices

Light, Dark and System. System follows your device, and it is something you opt into rather than the starting point.

Changing it quickly

There is a one-tap flip in the user menu at the bottom of the sidebar.

Changing it properly

The full three-way picker is in Settings, on both web and mobile.

Per device

The choice is stored on the device you set it on, so you can run light on a laptop and dark on a phone.