How do password generators measure the quality of password strength? E.g Bitwarden vs PasswordMonster are showing _completely_ different scores with same passwords

Example password: AXEaRX6uYHmj (randomly generated 12-character pw by 1Password)

Bitwarden's strength testing tool estimates: **"strong / 3 years"** to crack your pw

vs.

Passwordmonster's strength testing tool estimates: **"62 thousand years".**

This is just an example but you get the point: there's a bit of a difference between 3 yrs vs 62k years using the exact same password. Can anyone help explain this to a non-security person?

Abovementioned pw testing links:

Bitwarden: [https://bitwarden.com/password-strength/](https://bitwarden.com/password-strength/)

Passwordmonster: [https://www.passwordmonster.com/](https://www.passwordmonster.com/)

bitwarden cybersecurity password passwords password strength quality strength