LayerMix

Your sites at the ready.

LayerMix is only for: macOS (App Store)

$9.99 One-time
Buy for macOS
To change the layer
:  
Cmd + Scroll
To change the layer
:  
Cmd + Option + L
To exit LayerMix
:  
Cmd + Q
To change applications
:  
change to layer 0, then Cmd + Tab