We do not track you. If and only if you wish to subscribe to the Import Pro + Cloud 1GB or Cloud 2GB, a sign in is required in order for you to manage and upload your 3D models to the cloud. The sign in is with your apple ID, please read the following: https://www.apple.com/legal/privacy/data/en/sign-in-with-apple/ for more info. When you sign in you can provide an email or hide it as you wish. We will not share any data with third parties, we will not use your data for any other purpose than for you to sign in to your cloud.