Compatibility
UXF should be fully compatible with all major build targets, including PC, Oculus Quest, WebGL, WebXR, Android & iOS. However, data output is different across these build targets. The Data Handler system allows data to be handled differently depending on your configuration.
It is possible to implement your own data handler to handle data how you wish.
For best support use Unity Long Term Support releases (LTS). UXF supports Unity versions 2018 LTS and up.
UXF (<2.0) works with any Windows based Unity project, that means it is not currently compatible with Android/iOS, or other platforms like the Oculus Quest (unless via Oculus Link). There are no restrictions beyond the Windows requirement, it works with Oculus Rift, HTC Vive, Oculus Quest (via Oculus Link) or any headset compatible with Unity on Windows. It also works without any headset at all (e.g. keyboard/mouse based tasks).
For best support use Unity Long Term Support releases (LTS). Currently recommended is Unity 2019 LTS but 2017 and 2018 also work.