ToothFairy works with macOS 10.13 and later.
ToothFairy works with devices that can be connected via the macOS Bluetooth menu. Please make sure the devices you want to connect have been paired to your Mac and work reliably before using them with ToothFairy.
Switching Bluetooth devices between multiple Macs requires that the Bluetooth device can be paired with more than one computer/phone at a time; this is not supported by the current-generation Apple Magic Keyboard/Mouse/Trackpad.
The battery indicator works with devices that can show their battery level in the Bluetooth pane in System Preferences.