Enter a password, and Passphrase will estimate its strength.
Passphrase Password Testing Explained
Strong passwords should be difficult to guess. It is just that simple.
The entire purpose for having a strong password is to protect against guess or brute-force attacks wherein
bad folks repeatedly try to guess a password in order to access something that password is supposed to be
Passphrase tests a password for length, character set complexity (which is one of the best indicators of password strength),
character duplication, common character sequences, and, finally, for common password phrases.