Real ranked and ARAM games from Riot's public developer API, from the current patch and the one before it, all 173 champions. We collect from Iron to Challenger. But a rank-specific build needs enough games at that rank. Most ranks now have that for most champions. The very top ranks still do not, because far fewer games are played up there. We always say which one you are looking at, rather than quietly falling back.

Sorting by win rate alone is a trap. A rare build can look strong just because strong players are the ones using it. It can also look strong because you only still own that item in games you were already winning. We rank by what players at your rank really build, so you get the tested pick instead of a fluke.

Item order, every skill point, and power spike timing come from real match timelines. None of it is guessed.

The "Adapt to the enemy" items change based on who you are actually up against. Armour against AD, magic resist against AP, anti-tank against tanks.

Every recommendation has to clear a minimum number of games before we will show it. Item win rates have to come from a minimum number of different players as well. That way one person's hot streak cannot become advice. If we cannot back something up, we leave it out.