Note: You need to pay to unlock each face model if you want to export, remove the logo and use the other premium features for that face model.
FaceApp uses the TrueDepth camera, that is part of FaceID, to scan your face and create a 3D face model.
In-App Purchases - There is an In-app purchase option that allows you to unlock each face model.
Use your iPhone with the built-in 3D TrueDepth Camera to scan your face in such realistic detail that you feel like you are seeing your face inside your phone.
With the model unlock you can export the model in OBJ or STL formats (used for printing, other CAD software, games, avatar makers and more).