The problem I kept running into
Every time I joined a video call, I'd wonder — is my mic actually working? Is my webcam on? Are my speakers outputting to both channels?
Every tool I found either required a download, had annoying ads, or only tested one thing at a time.
So I built MicCheck Online — a free collection of hardware testing tools that run entirely in your browser.
What it includes
Mic Test — real-time audio levels, clipping detection, device switching
Webcam Test — camera preview, resolution & FPS readout
Speaker Test — left/right channel isolation, frequency presets (60Hz–16kHz), full sweep
Headphone Test — L/R channel isolation
Screen Tests — dead pixel checker, white/black/color screens, backlight bleed, uniformity
Keyboard Test — every key visualized in real time
Mouse Test — button, scroll, and movement tracking
The tricky parts:
The speaker frequency sweep was interesting to build — using OscillatorNode and exponentialRampToValueAtTime to sweep from 20Hz to 20kHz smoothly.
The stereo panning for left/right channel isolation uses createStereoPanner() — simple but effective.
Try it
https://miccheckonline.com — free, no signup, works on Chrome, Firefox, Edge, Safari.
Would love feedback from the dev community — what tools are missing? What should I build next?
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