d3vices

A-02AudioContext

Speaker test

Test your speakers or headphones. Play left, right and both channels separately, run a frequency sweep from 20 Hz to 20 kHz, and check stereo wiring without installing anything.

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Permissions

None. This test needs no browser permission at all.

Nearby instruments

A-01

Microphone test

Check that your mic is heard, see a live waveform, watch the input level and record a short clip to play back.

A-03

Camera test

See your webcam live, read the resolution and frame rate it actually delivers, and switch between cameras.

A-04

Screen share test

Confirm screen sharing works before a call, and see the resolution and frame rate the capture actually produces.

B-01

Display & dead pixel test

Full-screen solid colours, gradients and grids to find dead pixels, backlight bleed and colour banding.

B-02

Screen information

Resolution, device pixel ratio, colour depth, colour gamut, refresh rate, orientation and safe-area insets.

C-01

Keyboard test

Press every key and watch it light up. ANSI, ISO and JIS layouts, with rollover and ghosting detection.