Where the data comes from — League of Legends
Champion, item, rune and spell data is Riot's. Builds, win rates and matchups come from a fixed sample of ranked matches, and say so where they appear.
Champions, items, runes and spells
The 173 champions, their abilities, and every item, rune and summoner spell are from Riot's Data Dragon, patch 16.21.1, with its art. All of it is served from this site, except alternate-skin splash art, which loads from Riot's Data Dragon CDN when you open a skin.
Builds, tier list and matchups
Popular builds, win, pick and ban rates, tiers and lane matchups are aggregated from a sample of 19,511 public high-elo ranked matches on patches 16.13 and 16.14, collected on 23 July 2026. That sample is older than the champion data above, so a champion or item changed since then may be described by Riot's current data while its rates still reflect the earlier patch. Every page with these numbers names the patches they come from.
Small samples are flagged where they appear: lane cards mark matchups with fewer than 30 games, and the matchup lists rank by a sample-size-adjusted win rate rather than the raw one.
The team builder
The team builder's recommendations, composition score and first-purchase suggestions are worked out in your browser from the match sample and each champion's class. First purchases are role-based suggestions, not measured results.
What the standalone app had
This section began as a standalone app with a server of its own. Its accounts, player guides, community builds, votes, and imports of builds from other sites needed that server and were not brought over; the community section takes their place.