Coinzy (Android app by the Coinzy team) lets you delete your account and all its data at any time.
Email support@coinzyapp.com from the Google account you sign in with, with the subject “Delete my Coinzy account”. We will delete it within 7 days and reply to confirm.
Everything: your account (name, email, Google ID), portfolios, transactions, holdings, alerts, notifications, registered devices, sessions and purchase records. Deletion is permanent and cannot be undone. Server logs that may contain your IP address expire within 30 days.
Subscriptions are billed by Google Play. Deleting your account does not cancel them — cancel in the Play Store under Payments & subscriptions → Subscriptions.