Deleting your account removes your shelf, your sessions and notes, and your wrapper photos, and revokes Sign in with Apple for Seven Shelves. It can't be undone, so export your shelf first if you want to keep a copy.
In the app
Open Settings, tap Delete account, and confirm.
On the web
Sign in with a code from the app, open Account, and choose Delete account.
Without the app
Write to support@sevenshelves.example from the email address on your account, and the account is deleted within 30 days.