Receipt List doesn't have an account system, doesn't talk to a server, and doesn't use any analytics or advertising.
Everything you type — your checklist title and tasks — is stored only in your browser's local storage on your own device. It is never transmitted anywhere, never seen by anyone else, and is only ever used to show your receipt back to you.
Clearing your browser's site data for this page, or using the Clear All button, will permanently delete your saved checklist.