Laptop Lab: Zero-Install Browser Hardware Diagnostics

I built Laptop Lab — a single-page web app that tests your laptop's display, camera, mic, keyboard, touchpad, speakers and battery. No install, no dependencies, no data leaves your machine.

What it does

• Display: full-screen color fills for dead pixels
• Camera: live preview with real resolution and frame rate
• Microphone: level meter with peak hold
• Keyboard: on-screen layout, tracks rollover
• Touchpad & mouse: clicks, scroll, pinch, events/sec
• Speakers: per-channel tones, 100 Hz–10 kHz sweep
• Battery: charge level and state (Chromium only)

Technical notes

• Pure vanilla HTML/CSS/JS. No build step, no frameworks.
• AudioContext fallback chain for Safari (StereoPannerNode → ChannelMergerNode → mono)
• Battery API feature-detected with graceful message
• getUserMedia requires HTTPS — app detects and explains
• Stamp system uses localStorage with per-test thresholds

Links

• Live: https://lokilancer.github.io/Laptop-Lab/
• Code: https://github.com/lokilancer/Laptop-Lab