Pro calibration:
1) Adjust the overlay until it matches your real opening.
2) Tap Set Reference to lock a realistic size for this view.
3) Switching models will keep the same reference height automatically.
Door Preview — Full Screen
How to use
Tap Start Camera and allow permissions.
Drag with one finger to move the door overlay.
Pinch with two fingers to scale.
Use Auto-fit to center quickly.
Tap Save / Share to save to Photos (via Share Sheet).