Blitz.ggvsOP.GG

These two show up together because they answer the same basic question: "what happened in my games and everyone else's?". The difference is how they deliver it. OP.GG is web-first: enter a Riot ID and look up stats, no install required. Blitz.gg is overlay-first: install a desktop app that integrates with the LoL client and actively assists you during champ select and the match. One is for looking things up; the other is for automating the in-game flow.

Match history and the data they offer

Both cover the match-history core, but with different emphasis:

• OP.GG: an enriched public profile with historical rank, per-season evolution, per-champion win rate, most-played picks, and full per-match detail (builds, items with timeline, vision score, gold differential). It adds tier lists by role and rank, leaderboards, and Live Game.
• Blitz.gg: includes an OP.GG-style match-history dashboard accessible from the web, but its differential is what happens live: an overlay with real-time matchup stats, power-spike reminders, and an automatic post-game dashboard with summary and improvement recommendations.

For pure history and meta lookups, OP.GG is more complete and direct. Blitz adds automation layers OP.GG doesn't try to cover.

Usage mode: browser vs desktop client

This is the central divergence.

• OP.GG runs in the browser. No download, no mandatory login, no background runtime. Paste a Riot ID and you're done. That makes it ideal for quick champ-select scouting and one-off lookups.
• Blitz.gg delivers its real value through a desktop app (Windows and macOS, own runtime, no Overwolf) that detects the client's state and triggers contextually: overlay in champ select, item info in-match, dashboard on game end. Blitz's web app only covers dashboard and match history; the auto-import and overlay require installing the client.

Blitz weighs more in RAM and disk, and its model means accepting broad telemetry: the runtime captures signals from the client to feed its features. OP.GG, being web, has a smaller footprint.

Languages, monetization, and builds

• Languages: OP.GG covers more locales (including Korean, Japanese, Chinese, Russian, Vietnamese, and more); Blitz covers English, Spanish, Korean, French, German, and Portuguese.
• Monetization: OP.GG has a skippable Premium tier ($3/month) — 95% of what's useful is free — and ads an ad-blocker handles. Blitz Pro ($5/month) is notably more pushed: popups, banners, and locked features as teasers in the free version.
• Builds and runes: Blitz's are auto-derived, without heavy editorial curation, so for complex situational meta they can come out generic. OP.GG doesn't center on importable builds; that isn't its role.

Which one?

• You want to look up stats without installing anything → OP.GG. Web-first, instant, no background runtime.
• You need to auto-import builds and runes into the client → Blitz.gg. It's the one thing OP.GG doesn't do.
• Quick scouting in champ select → OP.GG. Paste the Riot ID and read the champion pool in seconds.
• You want an automatic overlay and post-game dashboard → Blitz.gg, if you accept installing the client and the telemetry.
• The aggressive paywall or telemetry bothers you → OP.GG, with lighter monetization.
• Limited specs or occasional casual use → OP.GG; Blitz's footprint isn't worth it for sporadic use.

They aren't mutually exclusive: many people use OP.GG as a daily lookup dashboard and add Blitz only if they value the in-game automation. If your goal is pure match history from the web, OP.GG is enough.