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I/O Checkup
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I/O Checkup - Online Peripheral Testing Tools

Device
57 focused checks / Computer tools first / 9 families
01Computer tool library

One bench. Every signal.

Browse the complete set by hardware family, then open exactly the measurement you need.

Computer order / 01

Keyboard

Key registration, typing rhythm, latency, and acoustic response.

01Keyboard Tester02Typing Test03Keyboard Latency Test04Keyboard Sound Test
02Select system

Start with the hardware in front of you.

Device-aware shortcuts keep the most useful checks close without hiding the complete tool library.

Current profile / Auto detectedComputer

Keyboard + mouse + display

Open keyboard check
03Fast paths

Quick checks for Computer users.

7 focused entry points, updated instantly when you switch the device profile above.

01KEY / MATRIXKeyboard Tester

Map every key, watch live telemetry, and catch missing or repeated input.

Open check02BTN / RATEMouse Click Speed

Measure CPS, burst speed, consistency, and click rhythm in one focused run.

Open check03RGB / PANELDead Pixel Test

Sweep full-screen solid colors to reveal stuck, dead, or inconsistent pixels.

Open check04CAM / LIVEWebcam Test

Preview the local camera feed and verify framing before a call or recording.

Open check05MIC / LEVELMicrophone Test

Confirm microphone input with a clear local level and listening check.

Open check06L / R AUDIOSpeaker Test

Verify left and right output placement with deliberate channel cues.

Open check07PRINT / SHEETPrinter Test

Print one controlled sheet for color, grayscale, alignment, resolution, and margin checks.

Open check
04Diagnostic protocol

A useful answer in four deliberate moves.

I/O Checkup is built for fast browser diagnostics, comparison, and troubleshooting—not laboratory certification.

  1. 01

    Choose the device

    Select the hardware in front of you so the shortest useful checks rise to the top.

  2. 02

    Open one focused test

    Each tool isolates a specific signal instead of burying the result in a generic scan.

  3. 03

    Run it locally

    Most checks start immediately. Browser permissions appear only when a tool needs them.

  4. 04

    Compare and repeat

    Change a cable, setting, port, or device, then rerun the same check under equal conditions.

05Local-first by design

Your hardware. Your browser. Clear signals.

Most tools start instantly and ask for access only when a browser API requires it.

01 / Immediate

No software install

Open a focused check, use the hardware already connected, and start in the browser.

02 / Explicit

Permissions stay visible

Camera, microphone, gamepad, pointer lock, and audio access appear only when needed.

03 / Repeatable

Results you can compare

Run the same check before and after a setting, cable, port, or device change.

System ready / Computer

Put the next signal under inspection.

Start quick checkBrowse library