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Bottleneck Checker is a free, open-source tool that shows whether a CPU and GPU hold each other back - as an honest range, not a fake single percentage.
Most bottleneck calculators spit out one confident-looking number no real benchmark could back up. Hardware does not work that way: the same pairing looks CPU-limited in a competitive shooter and GPU-limited in a ray-traced AAA game, and different again at 1080p versus 4K.
So this tool reports a range instead, weights the result by resolution and game type, and models DLSS/FSR upscaling. It covers 300+ CPUs and 140+ GPUs on a calibrated 0-100 gaming scale, with a balance meter, a confidence rating, and a rough FPS estimate.
It is plain HTML/CSS/JS - no build step, no framework, no tracking - and ships with a bundled static hardware snapshot, so it makes no server calls and works offline.
Built and maintained by BottleneckPC (https://bottleneckpc.com), where you will also find build recommendations, live prices, and per-game
Features
- Honest performance range, not a fake single percentage
- Weighted by resolution (1080p / 1440p / 4K) and game type (esports, AAA, sim, MMO)
- Models DLSS / FSR upscaling
- 300+ CPUs and 140+ GPUs on a calibrated 0-100 gaming scale
- CPU-to-GPU balance meter with a confidence rating
- Rough FPS estimate at your chosen settings
- Shareable results via URL
- No tracking, no server calls, works offline (bundled static data)
- Dependency-free - plain HTML/CSS/JS, no build step
- MIT licensed and free