Device Tools

Keyboard testers, screen defect detectors, refresh rate checkers, and hardware benchmark charts.

Input Device Testing

Keyboard Tester — Detect Chatter, Dead Keys & Test NKRO Free

Free online keyboard tester. Detect dead keys, check N-key rollover (NKRO), identify chatter and break contact, visualize key hold duration, test typing speed, and discover extra media keys. Real-time chord display with adjustable threshold. Works with mechanical, gaming, laptop, and wireless keyboards. 100% private, no download needed.

Mouse Tester — Test Double Click, Buttons & Scroll Online Free

Free online mouse tester. Test all mouse buttons (left, right, middle, back, forward) with real-time visual feedback. Check for double-click issues from worn microswitches — the #1 cause of mouse failure. Measure clicks per second with the CPS test, test scroll wheel precision, track cursor position, and view detailed click event logs. Works with wired, wireless, gaming mice and laptop trackpads. No download needed — runs 100% in your browser with zero data upload.

Display Testing

Dead Pixel Test — Free Online Monitor & Screen Defect Checker

Free online dead pixel tester for monitors, laptops, phones, and tablets. Display full-screen solid colors (white, black, red, green, blue, yellow, cyan, magenta) to detect dead pixels, stuck pixels, and screen defects. Test new monitors within return window, check used devices before buying, and diagnose display issues. Works on all devices with a modern browser — no download required. All testing runs locally in your browser for 100% privacy.