OpusChat is available in light mode and dark mode. This feature is currently available on iOS devices with iOS13 and above.

Light mode is in white color theme and dark mode in black color theme.

You can enable or disable this feature in OpusChat settings or your device settings.

Enable light mode/ dark mode in OpusChat
Go to Settings > Dark mode > You can choose Default to system / Light / Dark
When you choose Default to system, the appearance will follow your device settings. If you choose either Light or Dark in OpusChat, this will override the device settings.

Enable light mode/ dark mode from device settings
Go to iOS device Settings > Display & Brightness > Under Apperance
Light: Enable light mode
Dark: Enable dark mode.
Automatic: Enable dark mode at a time you specified.