If you own an NVIDIA RTX series GPU, you can use the webcam for face tracking with almost the same quality as the iOS app without using the iOS app.

The iOS app has the advantage of running at 60 FPS and being able to capture a bit of tongue movement; the NVIDIA GPU runs at 30 FPS, which is a bit slower, but much more comfortable since you can track using only the webcam without a smartphone.

To use NVIDIA face tracking, you need to get the "NVIDIA AR SDK" as well as the paid application "iFacialMocap Powered by NVIDIA Broadcast".

The "NVIDIA AR SDK" can be downloaded free of charge from the following page Download and install the SDK for your RTX series GPU.