If you save a password using a keychain or related, you may see the password stored under The Local domain (thelocal.com) in the keychain.
Otherwise, The Local sites should come up as piano or tinypass in your password manager under id.piano.io, piano.io, id.tinypass.com or dashboard.tinypass.com.
Please be aware of this if you are looking for a stored password and when you update your password.