Instant bottleneck analysis for your exact PC build. Pure data. Zero guesswork.
Pick the closest match to your build.
Checking against your library
WillItLag answers "Can my PC run it?" without downloading a single byte — a precision diagnostic engine that turns confusing spec sheets into a single 1–100 Rig Score and a 5-tier verdict.
Compared against real published minimum and recommended specs — not hand-wavy guesses.
500,000+ PC games plus the most-used Creator and WFH apps.
Specs auto-refresh from upstream. New game on Steam? We can check it the day it ships.
ChatGPT and friends guess. WillItLag measures. Here's why a focused PC bottleneck calculator beats a general-purpose AI for any hardware compatibility check.
Direct connection to the RAWG database of 500,000+ PC games — no AI hallucinations, no made-up system requirements. Every PC system requirements check is sourced from real, published spec sheets.
Your local hardware loadout is saved on-device for instant recall. Our bottleneck calculator runs the precise math against your exact CPU, GPU, and RAM — not a vague vibes-based estimate.
When a hardware compatibility check fails, we pinpoint the exact bottleneck and route you to a curated Amazon affiliate link for the right upgrade — not a wall of generic advice.
Installable, offline-capable, and lightning-fast. A real diagnostic utility for your gaming performance verdict — not a slow chat window waiting on a server roundtrip.
"Saved me from buying an RTX 4070 I didn't need. WillItLag told me my CPU was the actual bottleneck. One SSD later and Elden Ring runs buttery smooth."
"Finally a bottleneck checker that isn't a bloated Windows exe. Pure browser, real numbers, and the Amazon upgrade picks were spot on."
"I tested five different rig combos in under two minutes. The score changes just enough between RAM tiers to actually mean something."