Check whether one key press registers twice
Choose a key by pressing it in the pad. Release and press it again to compare same-key intervals with your flag threshold.
Focus here and choose a key
Ready. Nothing is uploaded.
Event trace
Recent events appear here. Export keeps the full capture until the capture limit is reached.
Does a flagged interval prove key chatter?
No. A flag means two accepted presses of the selected code arrived within your chosen threshold. Deliberate fast presses can do that too. Held-key auto-repeat is logged but never counted as a new press. Clear the capture to choose another key.
What this browser can measure
Browser events cannot distinguish a worn switch from firmware, a macro or deliberate tapping. Inspect repeatable single-press behavior before drawing a hardware conclusion. See the event and timing rules.
Try the related task
- Keyboard test: Press single keys or combinations to see down, up, repeat and rollover events live, with honest browser limits.
- Keyboard speed test: Choose a key or use the whole keyboard, then see presses per second, APM, per-key counts and your best run.
- Typing test: Type a licensed prompt, review WPM, accuracy and every error, then practise the missed words locally or export the measured result.
- Double-click test: See every browser click and its interval, flag suspicious repeats, clear the run, and learn what this test cannot prove.