Signal Desk
Which device do you want to check?
Try keyboard, display, sound, and camera checks without installing anything.
Check tools
- Input
Keyboard
See whether keys stick, miss, or respond as you press them.
- Input
Keyboard ghosting
Hold several keys and see how many the browser reports at once.
- Input
Mouse
Check whether buttons, the wheel, and side inputs appear in the browser.
- Input
Mouse double-click
Watch click intervals when you press the same button quickly.
- Input
Mouse wheel
Observe up/down wheel events, reversals, and gap patterns.
- Display
Screen
Step through color patterns to look for blotches or dead pixels.
- Display
Monitor patterns
Inspect gray steps, gradients, contrast, grids, and related patterns.
- Display
Refresh estimate
After Start, estimate Hz from browser frame timing.
- Display
Monitor backlight
Use dark patterns to visually check edge glow or uneven lighting.
- Audio
Microphone
Speak and watch whether the input level moves.
- Audio
Speaker
Check whether a low tone plays on the left and right.
- Audio
Headphones
Check left, right, center, and short spot tones at a low level.
- Camera
Webcam
Check whether the preview appears and looks focused.
- Game
Gamepad
Check whether buttons and sticks respond on screen.
- Game
Controller drift
Calibrate neutral with hands off, then watch how far the sticks move.
- Print
Printer
Use browser print to check color blocks, grids, text, and margins.
- Input
Touchscreen
See active pointer count and trails when you touch the surface.
- System
Device & browser info
Collect viewport, screen size, DPR, and other values the browser already exposes.
Scenario checkups
Run only the tools that fit common jobs—used PCs, video calls, gaming, or a new monitor—in a short guided order.
Used PC checkup
Walk through keyboard, mouse, display, audio, and camera in order.
Video-call checkup
Confirm speak, hear, and preview work in the browser before joining.
Gaming input checkup
Quickly review inputs and a browser refresh estimate before you play.
New monitor checkup
After connecting a new monitor, step through patterns, bleed checks, and refresh observation.
Popular problems
- Keyboard ghosting — Hold several keys and see how many the browser reports at once.
- Mouse double-click — Watch click intervals when you press the same button quickly.
- Refresh estimate — After Start, estimate Hz from browser frame timing.
- Controller drift — Calibrate neutral with hands off, then watch how far the sticks move.
How to use it
Pick a tool and watch the on-screen response. Your input, camera, and microphone data are not sent elsewhere.
How results are labeled
We keep confirmed, self-checked, unsupported, permission-denied, skipped, and error distinct. No overall health score.