A growing collection of free, privacy-first browser tools. Test gamepad drift, mouse polling rate, dead pixels, mics, and speakers. No install needed.

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CapyToolkit

About this app

CapyToolkit is a growing collection of free, privacy-first browser tools. Among its 50+ tools is a set of hardware testers for anyone who just bought a controller, a mouse, a monitor, or a microphone and wants to know it works as advertised. The gamepad tester shows stick drift and dead zones, the mouse tester measures polling rate and input lag, and the display suite checks dead pixels and flicker. Webcam tools analyze lighting, framing, and A/V sync, the microphone tester measures noise floor and latency, the speaker sweep finds resonances, and a MIDI tester times keyboard latency. Everything runs in the browser with no driver or install, and camera and microphone data stay on your device. The same site also offers developer, security, audio, math, and personal tools. It installs as an app, ships on the Microsoft Store, and works offline once installed. Always free, no account.