InputProbe
Hardware testers that show their error bars
What it does
Most online mouse testers measure your monitor: they count one movement per frame, so a 1000 Hz mouse reads 60 on a 60 Hz display. InputProbe reads the device events themselves. Every tool publishes its measured error band (from repeated runs on real hardware) and refuses to print a number when the capture can't support one. DPI, polling rate, button bounce, key rollover, eDPI. Free, no accounts, runs entirely in your browser.
Measure your mouse's real DPI against a physical reference, with the spread shown and the alignment error measured. Runs in your browser; nothing is uploaded.
Any angle works. The mouse glides on your mousepad or desk beside the reference, not on top of it — a loose sheet slips along under the mouse and reads low. Park the mouse level with one end. Your cursor disappears while the test runs; Esc brings it back. Three passes tell you whether your hand was steady . They cannot tell you whether it was right : if you stop a couple of millimetres past each end every single time, all three passes agree with each other and all three are wrong together. That error is a fixed distance, so it is a bigger share of a short reference than a long one, which is what makes it measurable. Run the test again on a reference of a very different length and we can…from inputprobe.com
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