Deleting a LinZi account removes it and its cloud backup from our servers: the email, the password hash, every sign-in session and the synced learning data. Deletion is permanent - a deleted account cannot be recovered.
Open LinZi → Stats → Settings → Account → Delete account. The account, its sessions and its cloud backup are removed immediately. On-device progress stays on the device. To remove only the synced copy of your progress while keeping the account, use Delete cloud backup in the same menu.
Write to support@linzi.app with subject "Delete my account", from (or naming) the email address the account was created with. We delete the account and its backup within 30 days and confirm by reply.
If you never created one, there is nothing on our servers to delete - learning data lives only on the device and is removed by uninstalling the app (or via Stats → Settings → Export progress → erase).