Google Play and the App Store require this page to exist outside the app. It does the same thing as Profile → Delete account.
The account disappears immediately. There is no waiting period and no confirmation email.
If you cannot open the app, write to support@splittingly.com from the address the account uses. We delete it within 30 days and confirm when it is done.
We ask you to write from the registered address because it is the only way we can tell it is really you — we hold no other identifying information.
What is deleted, and what is not
Deleted immediately: your profile, email address, display name, login credentials, preferences, and push notification token.
Kept, with your identity stripped: expenses and payments you entered in shared groups. They remain under "former member". Without them, everyone else's balances would silently change — the group would be told it owes different amounts than it agreed. Nobody can trace those entries back to you.
Full detail in the Privacy Policy, section 5.