Collection:
Display Apps
Tranquility
Tranquillity can change your display colors in various ways to give you a color scheme more suited to low light conditions (such as at night).
Switch display resolutions or adjust your screen brightness and colors (time-based) from the menu bar.
Check out these Mac Menu Bar Display Apps:
Collection:
Display Apps
Pliim
Collection:
Display Apps
Fenetre
Collection:
Display Apps
Dynamic Dark Mode
Instead of looking for the switch for dark mode in System Preferences, just click the icon in the menu bar. You can enable dark mode in dim lights, after sunset, or just anytime.
Collection:
Display Apps
Chameleon
Chameleon is a quick and easy way to change your interface, accent and highlight colors. Right click on the bar icon to toggler between Light & Dark modes.