Test Your PC Hardware
Right in Your Browser
Keyboard tester, reaction time test, typing speed test, CPS test, DPI checker, 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.
Gaming Monitor Buying Guide
Refresh rate, response time, panel type — what actually matters for gaming.
Read article →Monitor60Hz vs 144Hz vs 240Hz — Does It Matter?
Real-world difference in smoothness and competitive advantage explained.
Read article →KeyboardMechanical Keyboard Buying Guide
Linear vs tactile vs clicky switches — which is right for gaming and typing?
Read article →Mouse1000Hz vs 500Hz Polling Rate — Which Is Better?
Does doubling your polling rate make a real difference in competitive play?
Read article →MouseWhat Is eDPI? The Only Sensitivity Metric That Matters
How eDPI unifies DPI and in-game sensitivity into one comparable number.
Read article →HardwareCPU & GPU Bottleneck Explained
What causes a bottleneck and how to calculate yours.
Read article →MouseHow to Change Mouse Polling Rate
Step-by-step for Logitech, Razer, SteelSeries and more.
Read article →KeyboardMembrane vs Mechanical Keyboard
Cost, feel, noise, and durability — a side-by-side comparison.
Read article →MouseDPI vs Sensitivity — What's the Difference?
Why DPI alone doesn't determine how fast your cursor moves.
Read article →MonitorHow to Check Your Monitor Refresh Rate
4 ways to verify your Hz on Windows, Mac and Linux.
Read article →MouseWired vs Wireless Gaming Mouse — Which Is Better?
Latency, weight, battery, and price compared for competitive play.
Read article →KeyboardKeyboard Ghosting Test
What ghosting is, how to detect it, and how to fix it.
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.
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Works Anywhere
Compatible with all modern browsers across Windows, Mac, Linux, iOS, and Android.