If you Google 'password strength' the first result is https://www.passwordmonster.com/
This works like I described, it don't show 'dartboard requirements', only entropy. I think you've misunderstood what a password strength checker is. It's definitionally not a checklist like 'You need an uppercase letter, a lowercase letter, a number, a special character'. It's a tool which measures the strength i.e. the randomness or entropy of the password.
In the full picture though, in terms of UI/UX, the meter seems like only a downside. In the dartboard use case it's great because it displays what's still needed in terms users work and think with signalling e.g. "you still need a number, otherwise you're all set". People don't really think in bits of entropy though so ll that really is being signaled by either a meter or a normal failed validation hint is "more complexity and/or length needed".
There may be good cases for using a meter while simultaneously implementing good password requirement policy I'm not thinking of though.