diffed.lol answers one question — did you get diffed? — and backs it with counted statistics, not a black-box score. No machine learning, no opaque "OP rating". Everything below is arithmetic you could verify yourself.
We continuously crawl finished ranked games across every rank and count outcomes. For each game state (minute · team gold lead · objectives), we tally how often teams in that exact spot went on to win. Your match's curve is a lookup against that table — "teams in your spot at 20:00 won 22% (n=3,400)". A frequency, not a prediction.
Your stats are compared to your own rank band (Iron–Bronze, Silver–Gold, Plat–Emerald, Diamond, Master+), your role, and your champion where the sample allows. A Gold player is measured against Gold players — never against challenger. Built from 1,830 counted games, refreshed continuously.
Per game we measure CS/min, CS@10, gold/min, vision/min, kill participation, damage share and early deaths — each as a percentile and a gap vs your band's typical value. "The one thing to fix" is your highest-impact gap, with the cost quantified in gold.