Password Strength Test | How easily could a hacker crack your password?
Password Strength Test has some unique features. They have data of the most frequently used passwords. This means if a user enters a password that is very common (and therefore likely easy to guess) site will let users know so that user can avoid it.
Although, the website claims that it does not store tested password, but you should not enter your real password. You can test your password by modifying some characters.