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Is Your Hardware Working? Find Out in Seconds

Browser diagnostics for microphone, webcam, keyboard, speakers, and display. 90 tests across 9 categories, zero installs — all processing runs locally on your device.

Start Testing
90 Tests
100% Free
Zero Uploads
No Install Required
100% Private
Open Source

How It Works

Open Your Browser

No download or installation needed. Works on Chrome, Firefox, Safari, and Edge.

Run a Test

Select a hardware test and grant permission. All processing happens locally on your device.

Get Results

See instant results with detailed diagnostics. Nothing is ever uploaded to any server.

Choose a Category

Audio / Sound

Mic, speaker, headphone, bass, frequency, surround sound, latency, and white noise tests

10 tests →
Microphone TestSpeaker TestHeadphone TestBass TestHearing Test+5 more

Input Devices

Keyboard, mouse, touchscreen, gamepad, double-click, drag, and scroll tests

10 tests →
Keyboard TestMouse TestClick SpeedTyping SpeedTouchscreen Test+5 more

Display / Monitor

Dead pixel, refresh rate, color accuracy, contrast ratio, uniformity, and burn-in tests

12 tests →
Dead Pixel TestRefresh RateColor AccuracyResponse TimeBacklight Bleed+7 more

Camera

Webcam preview, FPS, resolution, recording, face detection, and barcode scanner

6 tests →
Webcam TestCamera FPSLighting CheckVideo RecordingFace Detection Test+1 more

Network

Speed test, latency, FPS counter, benchmarks, download, upload, and connection stability

8 tests →
Speed TestLatency TestFPS CounterBrowser BenchmarkWebGL Benchmark+3 more

Gaming

Reaction time, aim trainer, input lag, frame timing, audio sync, and tap speed

8 tests →
Reaction TimeAim TrainerInput LagDPI & PollingScroll Speed+3 more

System Info

Battery, screen size, GPU, browser, storage, memory, CPU, device summary, audio devices, and media support

10 tests →
Battery StatusScreen InfoGPU InfoBrowser InfoStorage Info+5 more

Mobile

Vibration, gyroscope, accelerometer, compass, ambient light, GPS, orientation, and pressure

8 tests →
Vibration TestGyroscope TestAccelerometerCompass TestAmbient Light Test+3 more

Connectivity

Bluetooth, WiFi, USB, HDMI, serial port, MIDI, and network info diagnostics

18 tests →
Bluetooth TestWiFi TestEthernet TestUSB TestHDMI Test+13 more

FAQ

Is Diagno really free to use?

Yes, 100% free. Diagno is ad-supported. All 90 tests are available without payment, accounts, or subscriptions. The codebase is open source.

Is my data safe during hardware testing?

Your hardware test data is safe: audio, video, and input data are processed locally in your browser and are never uploaded to a Diagno server (Diagno is a static site with no backend of its own). Note that the website does use Google AdSense and Google Analytics, which may set cookies — see our Privacy Policy for details.

Which browsers and devices are supported?

Chrome 90+, Firefox 90+, Safari 15+, Edge 90+. Works on desktop, laptop, tablet, and mobile. Some tests (Bluetooth, USB) require Chrome or Edge due to Web API availability.

Do I need to install anything to run the tests?

No. Diagno runs entirely in your browser via Web APIs (MediaDevices, Web Audio, Canvas, KeyboardEvent). No plugins, extensions, or downloads. Just open the page and start.

How accurate are Diagno's hardware tests?

Tests use the same Web APIs as professional applications. Audio analysis uses real-time FFT via WebAssembly for SNR and THD measurements. Display tests use sub-pixel Canvas rendering. Results match dedicated native apps within typical browser API precision.