Built for ranked players who want an edge before lock-in.

YordleDiff is a free, browser-based League of Legends coaching site — the tier list, the build optimizer, the jungle planner, the team builder, the win-condition analyzer. All of it runs in your browser, no login, no account, current-patch data.

What's on the site

Team Builder

5+5 champ select coach — bans, builds, win conditions, jungle path, all live as you draft.

Tier List

Per-role tier rankings on the current patch. Filterable by rank.

Win Conditions

Classify both teams into 8 archetypes and get a macro gameplan.

Build Optimizer

Per-champion builds with matchup-adaptive item swaps from real matchup data.

Synergy

Who pairs well with whom — pair win-rate deltas from real games.

Jungle Planner

An ML model picks your jungler's best route + gank read against the enemy comp.

Why it exists

The big League stat sites (op.gg, u.gg, lolalytics) are great at what — what to build, what's strong, what wins. They're not great at how to play this exact game: how your team comp wants to fight, which 5 bans hurt your specific allies most, what the jungler's clear route should be against this enemy comp. YordleDiff is built to fill that gap.

It's also built to be opened immediately. No account funnel, no install, no "claim your profile" step before you can see anything. Open the tool, see the data, close the tab.

How the data works

Recommendations come from current-patch ranked games at Emerald+, scraped via the same public APIs the other LoL aggregators use. Build paths, runes, matchup win rates, synergy deltas, ban impact — all real-game numbers. Every recommendation surfaces its sample size and win rate; nothing is invented or "balanced for fairness."

Where the engine has to pick between a popular item and a higher-win-rate one, it uses a Wilson lower bound on win rate — statistically defensible “this actually wins” ranking rather than chasing the most-built item. Same logic for boots vs comp, for slot picks vs the enemy comp, and for the “Highest WR” parallel build path on each champion.

What makes it different

Team Builder is the unique piece — no other free site has an integrated champ-select view that aggregates bans across your whole team, suggests counter-picks blended with synergy + role gap, and feeds the picked comp into every other tool live as you draft.
Win Conditions classifies both teams into archetypes (Teamfight / Splitpush / Poke / Engage / Disengage / Scaling / Pick / Dive) and gives the matchup read + game script. Most sites stop at "build this item."
Jungle Planner runs an ONNX model in your browser to predict the best clear route per champion against the picked comp — not a hand-coded heuristic, a real per-champion learned policy.
The whole site is browser-only. Your draft never leaves your device. Shareable via URL with friends for 5-stacks, no signup.

Status

YordleDiff launched May 2026, on patch 16.10. Data refreshes every few days via a manual scrape pass; once Riot's biweekly patch ships, we re-scrape and update. The full stack — the engines, the UI, the data — is built and maintained by a tiny team that plays the game daily.

Independent — not endorsed by Riot Games. YordleDiff isn't affiliated with Riot or its publishers. League of Legends and all related champion art, names, and assets are property of Riot Games, Inc.

Get in touch

Bug, idea, or just want to say something? Use the contact page. We read everything.