Yam Display supports from OS X Mavericks (10.9) to macOS Mojave (10.14).
Yam Air supports from OS X Yosemite (10.10) to macOS Mojave (10.14).
For macOS Sierra prior to 10.12.2, Yam Display/Air has following issues:
- Some apps can be displayed in black in Yam Display.
- Forced log out when using some features of Mission Control.
These issues can be fixed by updating macOS Sierra to the latest version (10.12.2 or later).
For macOS High Sierra, please check this FAQ: Yam Display for macOS High Sierra.