Unfortunately, you cannot activate Dark Mode exclusively for Yazio; it applies only to your device in general. You can do so in the general settings of your smartphone or tablet. 😎

Android:

• Starting with Android 10, you can find the Dark Mode setting in "Settings" > "Display" > "Dark theme" (toggle on/off).
• Please remember that Dark Mode cannot be deactivated while your device is in power-saving mode.

iOS:

• On iOS devices, you can activate Dark Mode via Settings > Display & Brightness > Dark