Paste in a real performance review — or a made-up one, it works either way — and this tool translates the corporate phrasing into what it's more likely actually saying underneath. "Room for growth" becomes what it usually means. "Exceeds expectations" gets read the way most people actually read it.
It exists because performance review language has developed its own dialect, one specifically built to soften bad news and undersell good news at the same time, and most people have had at least one review that needed translating.
Everything runs locally in your browser. Nothing you paste in is saved, logged, or sent anywhere — the whole point is that you can be honest with it.