WoW sims that run in your browser.
Paste a profile, hit run. That's it.
Quick Sim
Paste a SimC profile, hit run, see a DPS number in seconds.
Best in Bags
Search the gear already sitting in your bags for the best set you own.
Drop Optimizer
Score any loot drop against your active build before you pass on it.
|Rotations
Browse community rotations or write your own with real conditions.
Full engine, no queue.
The whole simulator compiles to WebAssembly and runs on your machine. No signup, no upload, no limit on how many sims you push.
Instant. No tokens, no API keys, no waiting. You click run.
Private. The engine never leaves your tab. Your profile data stays local.
Non-blocking. Keep a tab open, sim while you're reading. It does not block the UI.
Discord bot scores every drop.
Boss drops an item. The bot tells you who it's an upgrade for, ranked by DPS gain, before anyone rolls.
Instant pass calls. One command posts upgrade rankings for the whole raid.
One roster. Every character's profile is kept in sync with one command.
Auditable. Every roll is archived with the math that backed it.
Read the code that runs the numbers.
The engine, the site, the Discord bot. All of it on GitHub. PolyForm Noncommercial license.
Nothing hidden. Every formula and assumption is documented.
You can contribute. File an issue. Send a pull request. Fork it.
Zero telemetry. No tracking pixels, no analytics, no ad scripts. Ever.
Why it exists
Built so you can stop waiting for sims.
Existing tools are slow and the queue is annoying. WoW Lab runs the engine in your browser so you get numbers the moment you hit run.
Read the about page
Sims per minute in the browser
Specs supported today
Classes covered
License, forever