Find the fault in your mouse, keyboard or controller
A drifting stick, a double-typing key, a worn mouse switch: peripherals fail quietly, and it is easy to blame a game or a driver when the hardware is at fault. Check it here first. Everything runs on standard browser APIs and never leaves your device.
What's wrong with your gear?
Pick the symptom, get the right test.
Controller
Controller drift test
Sample both analog sticks every frame and catch stick drift on PS5, Xbox and Switch Pro pads before it ruins your aim.
Keyboard chatter test
Detect double-typing switches, measure N-key rollover and tell a failing key apart from a software issue.
Mouse double-click test
Find the worn switch behind the double-click bug, run a 5-second CPS sprint and estimate your polling rate.
Other device checks
Webcam Test · Microphone Test · Speaker Test · Screen Test · Multi-Touch Test · Touch Dead Zone · Phone Sensor Test · Reaction Test
Why test in the browser?
Hardware faults are easy to misdiagnose. A drifting thumbstick looks identical to a bad game config; a double-typing key could be a macro utility misbehaving. These tests read raw device data through the same browser APIs a web game would use, so you see what your computer actually receives and can separate a hardware fault from a software setting in under a minute. Nothing is installed, nothing is uploaded, and there is no account to create. GearLint works offline once the page has loaded.
Buying or selling used gear? Run the relevant test on the spot before money changes hands: stick drift, switch chatter and worn mouse buttons show up in seconds. Filing a warranty claim? A documented result from these pages makes the support conversation short and factual. Start with the controller drift test, the keyboard chatter test or the mouse double-click test.
Guides
Every test has a walkthrough behind it: how to connect the device, which numbers matter, and what to do when the verdict comes back bad.
Not sure which device is at fault? Start with the input device fault diagnosis — it maps the symptom to the right test, then to repair, replace or return.
How to test controller drift
Connect any PS5, Xbox or Switch pad and read the resting values like a repair tech.
Stick drift fix
Confirmed drift? Clean it or replace the module — the full decision path.
How to test keyboard chatter
Ten minutes to separate a failing switch from a software setting — per key.
How to fix keyboard chatter
Clean it, swap the switch or claim warranty — in that order.
How to test mouse double-click
Twenty clicks per button, read the gaps, decide between warranty and a swap.
How to fix the double-click bug
Rule out settings first, then the switch — and what a claim needs.
Keyboard rollover and ghosting
Why a keyboard drops a key when you hold four at once.
How to check your mouse DPI
The 360° method, without special hardware.