What you can check
Everything you want to verify after buying a new keyboard or mouse, right before a video call, or when buying a used monitor or phone, in one place. Each test shows the raw signal your browser receives from the device, which helps you tell a hardware fault from a settings problem.
- Input devices: every key and rollover on your keyboard, mouse buttons and wheel, double-click faults, polling rate, touchscreen dead zones, gamepad buttons and sticks
- Camera and sound: your webcam's real resolution and frame rate, microphone level and recording, speaker left/right and frequency range
- Display: dead pixels, backlight bleed, gradient banding, refresh rate
- Hand speed: click speed (CPS) and spacebar mashing
How your privacy is handled
The camera and microphone turn on only after you start a test and your browser asks for permission. Video and audio are processed inside your browser on this device and are never sent to a server. Snapshots and recordings disappear when you close the page unless you save them yourself. Scores such as click speed stay in this browser's storage.
If something looks wrong
- Try again in another browser or another USB port. If the result is the same, the device itself is the likely cause.
- Wireless devices are affected by battery level, distance and Bluetooth interference.
- Check your operating system's camera and microphone permissions and default devices.