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In the app, under your account settings. It removes your account and the data tied to it. One thing to do separately: if you have a subscription, deleting your Cartee account does not cancel it. Subscriptions belong to your App Store or Google Play account, and only you can cancel them there.

Yes, both. You can also use an email address and a password if you would rather.

Because household invitations are sent to email addresses, so yours has to be one you genuinely own — otherwise an invitation meant for you could land somewhere else. Signing in with Apple or Google skips the step, since they have already verified it.

Tap the Accept invitation button in the email. If you already have Cartee, it opens straight to the invitation. If you do not, you land on a page that explains who invited you and points you to the App Store or Google Play — install Cartee, sign in with the address the invitation was sent to, and it completes itself. There is no code to enter and nothing to copy across.

Through the App Store or Google Play, alongside your other subscriptions. That is also where you cancel or change a plan — it is not something we can do from inside Cartee.

They stay with the plan owner: shared lists convert back to private lists on the owner's phone, and other members lose access. Your data is never held hostage.

Anyone else can leave whenever they like. The person paying cannot simply walk away — that would strand everyone — but they can hand the household over to another member at any time. Handing over the household does not hand over the payment: subscriptions belong to the store account that bought them, so whoever takes over subscribes themselves.