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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 Test Speaker Test Headphone Test Bass Test Hearing Test +5 more

Input Devices

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

10 tests →
Keyboard Test Mouse Test Click Speed Typing Speed Touchscreen Test +5 more

Display / Monitor

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

12 tests →
Dead Pixel Test Refresh Rate Color Accuracy Response Time Backlight Bleed +7 more

Camera

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

6 tests →
Webcam Test Camera FPS Lighting Check Video Recording Face Detection Test +1 more

Network

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

8 tests →
Speed Test Latency Test FPS Counter Browser Benchmark WebGL Benchmark +3 more

Gaming

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

8 tests →
Reaction Time Aim Trainer Input Lag DPI & Polling Scroll Speed +3 more

System Info

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

10 tests →
Battery Status Screen Info GPU Info Browser Info Storage Info +5 more

Mobile

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

8 tests →
Vibration Test Gyroscope Test Accelerometer Compass Test Ambient Light Test +3 more

Connectivity

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

18 tests →
Bluetooth Test WiFi Test Ethernet Test USB Test HDMI 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?

Architecturally guaranteed. Diagno has no backend server — it's a static site. Audio, video, and input data never leave your browser. Verify: open DevTools Network tab during any test to see zero outbound requests.

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.