It does NOT just dim the brightness to zero, the screen is actually turned off via the Apple hardware API, the according desktop is removed, so you have a clean "one big monitor" setup.
- Safe fallback if you turn off the external monitor(s), unplug the monitor cable(s), the app crashes or anything else happens. - Keyboard, touchpad and TouchID still work fine. - Automatic restart. 2 Megabyte size. - Totally niche, I know, but it helps me to concentrate.
The app is commercial ($9 once), but everybody who DMs me here gets a *FREE* lifetime license, and everybody who uses in the feedback form (to report if the apps works on your setup) gets a free lifetime license too.
Thanks ;)