We store the minimum needed to run your collection: your email, profile, records you add, and items you mark as wishlist or for-sale.
Your collection visibility is controlled by you in Settings. We never sell your data, and we don't share it with third parties beyond what's needed to operate the service (hosting, authentication, the Discogs catalog lookup).
You can delete your account at any time from Settings, which removes your profile and collection data.
Questions? Reach out via the contact info on your account.