The locked rule.
A chat assistant works for you — which is exactly the problem. It helps you make the case for the answer you were hoping for. RolloutGrade makes you set the success rule before you see the result, then holds you to it. You can't negotiate with a threshold you locked last month.
The same answer every time.
Ask a chat model the same question twice and you can get two different analyses — different method, different framing, sometimes different arithmetic. RolloutGrade runs deterministic, tested code. Same upload, same answer, every re-run, for anyone who asks.
The refusal.
A chat assistant will always answer “did my launch work?” — even when your data can't support an answer. RolloutGrade is built to refuse: without a valid comparison, it will not call a result incremental, it will not fill gaps with zero, and it says exactly what's missing. Sometimes the most valuable output is “your data can't tell you that yet.”
Memory across decisions.
Every study you run is recorded — the rule you set, what the evidence said, what the verdict was — in a Decision Ledger that doesn't rewrite history. Your fifth launch can be read against your first: same definitions, same math, no re-arguing the method.