This flashes bright colors very fast. Don’t use it if you are sensitive to flashing light.
Clear image retention
This can fade temporary image retention, but it can’t fix permanent burn-in. Noise flickers fast, so skip it if flashing light affects you.
Screen light
Start test tones at a low volume, especially with headphones, and skip the pixel fixer and the noise pattern if flashing light affects you. These tests check your devices, not your hearing or eyesight.
Check your microphone, webcam, speakers and screen in one place before a call, a stream or after buying new gear. Each test starts with one tap: a live mic meter with recording, the real camera resolution and frame rate, left and right sound with a frequency sweep, and full-screen colors to spot dead pixels. Nothing is uploaded.
How to use
- Pick a tab: Microphone, Webcam, Speakers or Screen.
- Microphone: press Test microphone and allow access. Speak — the meter, wave and status show whether sound arrives. Record 5 s to hear yourself.
- Webcam: press Start camera and allow access. The badge shows the real resolution and measured frames per second; switch cameras or resolutions below.
- Speakers: tap Left, Center or Right. Use the frequency slider or the sweep to check bass and treble.
- Screen: tap a color or start the full-screen test, then tap or press → to step through colors. Look for dots that don’t match.
- The browser asks for permission only after you press a start button. Audio and video never leave your device; recordings are kept in memory until you close the page.
- If no sound is detected, check the mute switch on your headset, the input level in your system sound settings and that the right device is selected.
- Out of phase should sound thin and hard to place. If In phase sounds that way instead, one speaker’s wires are swapped.
- A dead pixel stays black on every color; a stuck pixel stays red, green or blue. The fixer may help stuck pixels after 5–10 minutes, but it can’t repair dead ones.
What each test checks
Microphone: a level meter in dBFS, waveform and spectrum show whether sound arrives and how loud; a 5-second recording lets you hear yourself. Webcam: a live preview with the resolution the camera actually delivers and the measured frames per second, which often differ from the box. Speakers: voice, tone or noise in the left, right or both channels, a phase check, a tone generator and a 20 Hz to 20 kHz sweep.
Screen: full-screen solid colors, gradients and pixel grids reveal dead or stuck pixels, banding and backlight bleed. A separate burn-in page checks OLED retention and offers a white screen and a screen light.
Before a video call
Run the mic test with the headset you will use and speak at normal volume: peaks around −20 to −10 dBFS are healthy, and a red clipping warning means the input gain is too high. Start the camera to check framing and light, and confirm the frame rate; 15 fps or less often means the room is too dark. Play the left and right speaker test with headphones on to confirm both sides work and are not swapped.
Frequently asked questions
How do I test my mic and camera at the same time?
Open the Microphone tab and start it, then switch to Webcam and start the camera; both stay on until you stop them or close the page.
Is my audio or video recorded or uploaded?
No. Everything runs in your browser. The 5-second mic recording stays in memory until you close the page and is never sent anywhere.
Why does the browser ask for permission?
Browsers require permission before a site can use the microphone or camera. It is asked only after you press a start button.
Why is my device not listed?
Check that it is connected and not in use by another app, then allow access and pick it from the device list. Some browsers show names only after permission.
Does it work on phones?
Yes. Phones can test the mic, front and back cameras, speakers and screen; switching speaker outputs depends on the browser.