What you need

iPhone X and later (iPhone X, iPhone XS/Max, iPhone SE (2nd Gen), iPhone XR, iPhone 11/Pro/Max, iPhone 12/Pro/Max, iPhone 13/Pro/Max)
Head Tracker app
opentrack installed on PC
Extract opentrack profile zip file (default.ini) into Documents\opentrack-2.3 folder

Check out the tutorial from Ozzy Safa

Installation (~5 minutes)

Following the setup instruction in this post

Setup Head Tracking Curves (~5 minutes)

Following this setup guide

Next Step

Open opentrack and start tracking before launching your simulator game.

Questions?

If your trial session expires before finishing your setup, you can extend the trial by go to the app’s Network Configuration screen, and press “Start” again.

Check out the FAQ for common problems, tips for phone placement and battery usage.