Deleting your Keyholder account
Keyholder does not store any user data apart from the Account Name and Password that you chose on account creation.
Note that Keyholder does use your email address if you want to reset your password. The email address is not stored by the app or the Keyholder server - it is simply used to send you a password reset code.
To delete your account, open the Keyholder app and tap on the Additional Page (the menu item with the ellipses ...). Press the Delete Your Account button. Confirm that you really do wish to delete the account. The account will then be deleted. Your account name and password are deleted, which is the only data that Keyholder holds for your account. No data is retained.
If this does not work you can also request account deletion by emailing firstname.lastname@example.org