U.GGvsOP.GG

Almost every LoL player ends up with both tabs open, and for good reason: they cover the two questions you ask constantly. "What do I build on this champion?" is answered more directly by U.GG than anything else. "How did I do?" or "who is this opponent?" are answered canonically by OP.GG. Both are web-first, free, with no mandatory login and no aggressive paywall, so the choice isn't about budget but about workflow.

Entry point and focus

The fundamental difference is where you start:

• U.GG starts from a champion. Search "Yasuo mid" and get the current-patch build, runes, summoner spells, skill order, and matchups, computed over millions of aggregated games. Match history exists but is complementary.
• OP.GG starts from an account. Enter a Riot ID and navigate to its rank, per-champion win rate, most-played picks, and the full detail of each match. Builds and tier lists exist but are secondary.

Both have tier lists by role and rank and per-champion stats, so they overlap there. The difference shows up depending on which question you arrive with.

Data and depth

U.GG presents the build item by item with associated win rate and pick percentage, plus a Counters section with per-matchup percentages and Probuilds from professional players (useful on new patches before aggregated data stabilizes). Its tier list uses a proprietary algorithm weighing win rate and pick rate, but doesn't publish the exact formula.

OP.GG goes deeper on the player side: historical rank, per-season evolution, aggregated KDA, and per match it shows each player's build, items with a timeline, vision score, and gold differential. It includes Live Game for real-time info during a match and regional Leaderboards.

Neither is the pick for deep statistical theorycrafting: for granular breakdowns by power-spike timing or enemy composition, Lolalytics and League of Graphs go further than both.

Languages, platforms, and monetization

• Platforms: both are web plus an optional desktop app for Windows and macOS. U.GG's desktop mainly serves to auto-import runes into the client; neither requires installation for web lookup.
• Languages: U.GG covers English, Spanish, Korean, French, German, and Portuguese. OP.GG reaches further with twelve languages, including Japanese, Chinese, Russian, Vietnamese, Thai, and Indonesian.
• Monetization: both are free with ads and an optional Premium tier (~$3/month) that removes ads and unlocks filters. In both, 95% of use cases are covered by the free version; an ad-blocker handles most of the annoying mobile ads.

Which one?

• A champion's build and runes → U.GG. Single view per pick + role, the fastest for "what do I build".
• Counters and bans before a ranked game → U.GG. The Counters section shows which picks you beat or lose to.
• Reviewing your last match or rank progress → OP.GG. The de-facto summoner tracker.
• Scouting teammates or opponents in champ select → OP.GG. Paste the Riot ID and see champion pool and recent form.
• Stats in a small region → OP.GG. The broadest regional coverage in the ecosystem.
• Importing runes straight into the client → U.GG, via its optional desktop app.

They're complementary more than rivals: most players keep U.GG to prep the pick and OP.GG to check the account. Bookmarking both covers the full pre-game and post-game loop.