Bench-grade checks · in the browser
Test your hardware in seconds.
Something acting up before a call, after a spill, or on a brand-new machine? Run the check right here. No downloads, no uploads, no accounts — every test executes on your device, and every tool publishes exactly how it works.
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Input
Keyboard TesterPress every key and watch it register. Find dead keys, chattering switches, and measure rollover.
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Audio in
Microphone TestLive level meter and waveform, plus record-and-playback so you hear what a call hears.
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Display
Dead Pixel TestCycle solid colors to spot dead, stuck, or hot pixels — with a stuck-pixel fixer mode.
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Video in
Webcam TestSee what your camera sees: live preview with resolution and frame-rate readout, mirror toggle, and a freeze-frame check.
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Input
Gamepad TesterPress every button and work both sticks — live button, trigger, and axis readout that also catches drift.
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Display
Screen RulerAn on-screen ruler in centimeters and inches, calibrated against a bank card so it matches the real world.
Guides
The deep dives behind the tools — what the numbers mean, what causes the faults, and which fixes actually last:
Why these tests run locally
Hardware diagnostics don't need a server. Your browser can already read key events, meter a microphone, and paint a screen — so that's all these tools do, with the code running on your machine and nothing sent anywhere. It's faster, it works on a flaky connection, and it means testing a microphone doesn't require trusting a stranger with your audio.
Each tool's page explains its method — what's being measured, how, and where the limits are. If a result surprises you, the explanation is right below the test.