What score does this give my resume?

None. It reports a count — how many of your bullets carry evidence, out of how many bullets you have — and marks which ones do not. A score out of a hundred would be a number with nothing behind it.

Does it rewrite my bullets?

No. It says which lines a recruiter is reading past and why. The words stay yours; nothing is generated and nothing is invented about your experience.

Yes, and there is no account. The check runs on text patterns rather than a language model, which is why it can be given away.

What a check can honestly tell you

Most resume checkers hand back a number out of a hundred. There is nothing behind it — no recruiter read the document and no system reported a verdict on it. What can be measured is narrower and more useful: how many of your bullets are evidence, and which ones are a job description with your name on top.

Two bullets from one resume

Automated recurring reporting, eliminating 45 minutes of daily compilation.
Evidence. A number, and it is the number that changed. A reader learns what happened, not what the job was.
Documented business processes and workflow changes to support consistency.
A duty. Anyone in that seat does this. The line ends on an abstract purpose where the outcome should be, so it never says whether anything improved.

A style linter passes both. It checks opening verbs, passive voice and a list of banned clichés, and none of those separate these two lines. On the resume this pair came from, ten bullets in twelve were the second kind.

The three things it measures

Stated in full, because a measure whose definition is hidden is a score with extra steps.

EvidenceA number, or a named thing plus a stated change.: A digit is proof on its own. Without one a bullet still counts if it names what it touched and says what changed — “Replaced the Excel hand-off with a Power Automate flow” is evidence with no figure in it.
A purpose clauseAn abstract benefit hanging off the end of the line.: “…to support consistency”, “…for operational decisions”. The reader is told what the work was meant to achieve and never whether it did. A tail carrying a number is a result, not a purpose, and is left alone.
InterchangeableNo number and nothing named.: The line could sit on anyone's resume in the same function. This is the one that needs rewriting rather than trimming.

What it will not do

No score. A count, over a denominator you can verify by looking at your own page.
No rewriting.It marks the line and says what is missing from it. The words stay yours — this product does not invent anyone’s experience, and a checker that writes your bullets for you is doing exactly that.
No verdict on you. A thin page is usually a page where the numbers were left out, not a career without any.