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In the app, under your account settings. It removes your account and the data tied to it. If you own a household that other people are in, you are asked to remove them first — deleting your account also deletes the household's shared lists, and they would lose them without having agreed to it. The app walks you through it as part of the deletion. 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 — they take the payment and send the receipts. If you pay for a household, Account → Subscription & billing in Cartee shows your plan, when it renews and what you have bought, and lets you move from Duo to Family. Cancelling and turning off renewal happen in the store; that same screen takes you there.

While the App Store or Google Play is still retrying a failed payment, nothing changes. Once the subscription has actually ended, everyone in the household can still open the shared lists for 7 days, but nobody can change them — time for the owner to keep a copy on their phone or renew, and for anyone else to make their own. Renewing within 30 days brings everything back — or, after the first 7 days, you can choose to start a new household instead. After 30 days, the household and its shared lists are permanently deleted.

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. They turn off renewal first; the time already paid for then moves to the new owner, so the household keeps running until it ends. To keep it after that, the new owner subscribes — and subscribing early loses nothing, because the handed-over time is added on. If you are the only one left in the household, you can leave once renewal is turned off — and that deletes the household and its shared lists.