LumosNox

Not satisfied with the automatic light/dark appearance mode?

LumosNox lets you switch instantly between Light and Dark appearance with a keyboard shortcut, without breaking automatic mode!
The app lives in your Mac's menu bar and can be launched automatically when the computer starts up.

And if you are an iOS developer, as a bonus, you can also toggle the appearance of your Xcode simulator with a keyboard shortcut.

Download it and enjoy it, it's free!

Nicolsa & Marie