Short answer: You can permanently delete your Typeshutter account from account settings.
Steps
Sign in to your account.
Open Account settings.
Select Delete account.
Read the deletion warning carefully.
Confirm deletion only if you are sure.
Notes
Account deletion is permanent and cannot be undone.
You may not be able to create a new account using the same email address.
Data deletion can take up to 30 days, except where longer retention is required or permitted by law.
Troubleshooting
If you only want to stop paid billing, manage or cancel your subscription instead of deleting the account.
If you cannot sign in, contact support before requesting account deletion.