Champion, item, and rune data is pulled live from Riot's Data Dragon, so it stays current with each patch automatically.
Keep lane, sidelane, and teamfight notes per champion matchup, plus a live enemy ability cooldown reference. Your written notes are stored in this browser.
Build a combo cast by cast - Q, auto, W, auto, R - and see exactly what it does to one or more enemy champions, step by step, at their level, items and stats.
Password-gated shared matchup notes with a group. Every line is owned by whoever wrote it, and build picks are votes with public tallies. Stored on a shared server, not just this browser.
Your matchup notes, rune picks, and custom tooltips live only in this browser. Export them to a file to back them up or move them to another device, then import that file there. The file isn't plain text - champion/item data isn't included either, it re-downloads automatically.
Hover any underlined term throughout the app for a quick explanation - same idea as tempo tooltips in a strategy game. Champion abilities, items, and runes get the same treatment wherever they appear. Want your own reminders on top of the built-in glossary? Add them on the Tooltips page.