Test Your PC Hardware
Right in Your Browser
Keyboard tester, reaction time test, aspect ratio calculator, dead pixel test and more. All free, all instant, no installation needed.
Featured Tools
Reaction Time Test
How fast are your reflexes? Click when the screen turns green and get your reaction time in milliseconds.
Open tool →Keyboard Tester
Press every key to test for ghosting, N-key rollover, and mechanical switch actuation.
Open tool →Aspect Ratio Calculator
Calculate the perfect aspect ratio for any resolution, monitor, or custom crop size.
Open tool →All Tools
Click any tool to open it instantly — no download needed.
Keyboard & Mouse
Monitor Tests
Calculators
Network & Audio
PC Calculators
Instant calculations for gaming and hardware.
Latest Articles
Guides, tests, and explainers for PC gamers.
How to Change Mouse Polling Rate
Step-by-step for Logitech, Razer, SteelSeries and more.
Read article →HardwareCPU & GPU Bottleneck Explained
What causes a bottleneck and how to calculate yours.
Read article →KeyboardKeyboard Latency Test Guide
How to measure input delay and what counts as fast.
Read article →MonitorHow to Check Your Monitor Refresh Rate
4 ways to verify your Hz on Windows, Mac and Linux.
Read article →AudioAudio Latency Test
Headset-by-headset latency comparisons and what to look for.
Read article →MouseScroll Wheel Test Guide
How to tell if your scroll wheel is skipping or double-scrolling.
Read article →KeyboardKeyboard Ghosting Test
What ghosting is, how to detect it, and how to fix it.
Read article →MouseDPI vs Sensitivity — What's the Difference?
Why DPI alone doesn't determine how fast your cursor moves.
Read article →Why UltimatePCTools?
Every tool runs entirely in your browser — nothing is installed, nothing is tracked.
Instant Results
Tools run entirely in your browser memory. Zero latency between action and result.
No Account Required
Jump straight to testing. We never ask for your email or personal data.
Works Anywhere
Compatible with all modern browsers across Windows, Mac, Linux, iOS, and Android.