Device tests that run in your browser
Check your microphone, camera, keyboard, mouse, speakers or screen in one click. Nothing to install, nothing to sign up for, and when something is broken each page tells you how to fix it on Windows, Mac, Linux, iPhone, Android and Chromebook.
Every test runs entirely in your browser. No audio, video or keystrokes are recorded or uploaded.
Choose a test
Sound
- Mic test Live level meter, plus record and play back to hear yourself.
- Mic quality test dBFS levels, noise floor, clipping and a live spectrum.
- Speaker test Left and right channels, balance and volume.
- Headphone test Stereo imaging, bass response and frequency range.
Screen
- Screen resolution Native pixels, CSS pixels, and whether scaling is on.
- Dead pixel test Full-screen colours to reveal dead and stuck pixels.
- Refresh rate test Measures the Hz your screen is really running at.
- Touch screen test Draw to find dead zones, plus a multi-touch check.
Camera
Controls
- Keyboard test Every key lights as you press it, with a ghosting check.
- Mouse test Buttons, double-click timing and scroll wheel.
- Gamepad test Buttons, triggers, sticks and a stick-drift measurement.
Network
Reflexes and aim
- Reaction time test Five rounds, your average in milliseconds.
- Aim trainer Targets per second, accuracy, and how far you miss by.
- Click speed test Clicks per second, over 5, 10 or 60 seconds.
Why test in a browser?
Most device problems show up at the worst moment — five minutes before a call, or just as an online exam starts. A browser test is the fastest way to find out whether the problem is your hardware, your operating system's permissions, or the app you were about to use. You need nothing but the page you are already on.
These tests use the same browser APIs that video-calling apps use, so if a test here works, your device and drivers are fine and the problem lies in the app's own settings. That alone narrows most troubleshooting from an hour to a minute.
What “runs in your browser” actually means
When you press Start, your browser asks your permission and then hands the page a live stream from the device. That stream is read in the page and discarded. There is no upload code on these pages: no audio, video or keypress is sent anywhere, and closing the tab ends it. If you record a clip to play back, it is held in your browser's memory and never leaves the device.
Your browser will show its own recording indicator while a test is running — a dot in the tab, or a light beside your camera. That indicator is the browser telling you the truth about what is active, and it switches off the moment you press Stop.
Which test do you need?
Device faults rarely announce themselves clearly. If you are not sure where to start, work from the symptom rather than the hardware:
- Nobody can hear you on a call. Start with the mic test. If the level meter moves, your microphone is fine and the problem is in the calling app's own settings.
- You cannot hear anyone. Use the speaker test for laptop or desktop speakers, or the headphone test for anything you wear — plugging in headphones switches the output device silently, and that catches more people than any hardware fault.
- Your camera shows a black screen. The webcam test separates a blocked permission from a covered lens from a camera another app is already holding open.
- Letters repeat or do not appear. The keyboard test shows which keys reach your browser at all, which immediately rules the layout in or out.
- One click opens things twice. That is switch chatter, and the mouse test measures it — no human can click twice within 80 milliseconds, so anything faster is the hardware.
- A dot on your screen will not go away. The dead pixel test tells a dead pixel from a stuck one from a speck of dust, which decides whether it is worth a warranty claim.
- Your character moves on its own. Stick drift. The gamepad test measures how far your sticks sit from centre at rest.
- Part of your phone screen ignores you. The touch screen test maps which areas respond, and the shape of a dead zone says what failed.
- You want to know how fast you actually are. The reaction time test measures your reflexes, the aim trainer measures accuracy and whether your sensitivity is wrong, and the click speed test measures clicks per second — and spots a mouse double-firing, which inflates the score.
- Your game stutters or your character snaps backwards. That is usually jitter rather than ping, and the ping test measures both — a steady 60 ms beats an erratic 30 ms for anything live.
- Your new monitor does not look smooth. The refresh rate test measures the Hz your screen is really running at — frequently 60 on a panel sold as 144, because nothing switches it over automatically.
No sign-up, no install, no tracking
There is no account to create and nothing to download. Every test is a web page that uses the standard browser interfaces any video-calling site uses, which is why it works on Windows, macOS, Linux, ChromeOS, iPhone and Android without a separate version for each.
The site carries advertising, and a cookieless analytics script that counts page views without identifying anyone. Neither can see what your microphone, camera or keyboard is doing — those never leave the page. The privacy policy spells out exactly what each script does rather than summarising it.
If there is a test you would find useful and it is not here, the contact page reaches a person.