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Checkbench

Keyboard, mouse and mic tests

Shows the rule beside each result

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Test your keyboard, mouse, mic, webcam, speakers, screen and gamepad in one place. Nothing is uploaded.

  • 8device tests
  • 30 msdouble-typing threshold
  • Nothingto install, no account

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The number on top is the refresh rate of the screen you’re looking at, and the keyboard flags a key pressed again within 30 ms of release as possible double-typing.

One screen checks seven devices, from keyboard to speakers

  1. Press any keyPress any key and it lights up on the on-screen keyboard while the keyboard card says ‘Keys respond’.
  2. Click and scrollClick and scroll to get ‘Mouse responds’, then move the mouse fast for a number under ‘Updates per second (estimate)’.
  3. Turn on the mic and cameraPress ‘Check mic’, allow it and speak to get ‘Mic picks up sound’, or press ‘Check camera’ and allow it to get ‘Camera works’.
  4. Play each speakerPress ‘Left’ or ‘Right’ for a quiet 1.2-second tone on that side, and the card then says ‘Tone played’.

It can also

What it checks and discloses

Each verdict shows its threshold (30 ms for keyboard chatter, 50 ms for double-clicks and so on), and what a web page cannot see, such as a mouse's true USB polling rate, is stated plainly.

If your count stops at six keys, the basic USB report format may be why

Rules and sources

Mic and camera access
Access is requested through getUserMedia only when you press a button. If it fails, the browser's error tells the page whether the site is blocked, your system settings block it or no device was found.MDN: MediaDevices.getUserMedia() · Checked Oct 10, 2026
Mic level
Measured with echo cancelling, noise suppression and auto volume switched off on request. On a scale where 0 dBFS is the loudest value, passing −45 dBFS counts as picking up sound, and a signal cut off at the top is flagged as too loud.About Checkbench
Refresh rate
Timed with requestAnimationFrame over 120 frames, using the median gap. Within 1% of a common rate it says ‘about’ that rate, and if fewer than 75% of frames arrive on time it gives no number.About Checkbench
Keys held at once
Every key down at the same moment counts, modifiers included. The basic USB keyboard report holds six keys besides the modifiers.USB-IF, Device Class Definition for Human Interface Devices (HID) 1.11 · Checked Oct 10, 2026
Gamepad sticks
A resting average under 5% counts as centered and 15% or more as drifting. Gamepad API values are shown unfiltered, so games that ignore small offsets near the center may not show slight drift.Microsoft Learn: Getting Started With XInput in Windows applications (Dead Zone) · Checked Oct 10, 2026
What stays on your device
Mic audio, recordings, camera video and photos are handled inside the tab and never uploaded. The browser keeps only a few settings, such as your keyboard layout and the double-typing and double-click limits.Checkbench Privacy Policy

The pass marks are Checkbench's own rules, not an official standard, and a meeting app may clean up your mic, so a call can sound different.

More rules in About Checkbench

4 guides

  1. Keyboard typing double letters: how to confirm chattering
  2. Key rollover and ghosting: test how many keys register at once
  3. Microphone not working in the browser: a permission checklist
  4. How to check a new monitor for dead pixels and the right refresh rate

All guides

Fixed a false stuck-key alert on Mac and the 640×480 webcam cap

  1. The webcam test now asks for the camera's largest picture instead of 640×480.

  2. The mic level is now read with echo cancelling, noise suppression and auto volume turned off.

  3. Fixed a false stuck-key warning after pressing Caps Lock on a Mac.

  4. Launched 8 tests in English and Korean, with 4 guides in each language.

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