AV-H03
Keyboard Tester
Check every key on a full-size ANSI or ISO layout, test n-key rollover and catch chattering keys.
● Runs on your device; nothing is uploadedHow to use it
- Pick ANSI or ISO, then click the test area (or Tab to it).
- Press every key; tested keys stay shaded and held keys light up.
- Hold several keys together to see how many register at once.
- Check the chatter list for keys that went down twice too quickly.
- Press Escape or Tab to leave the test area.
Limits
- Layouts
- ANSI 104 keys, ISO 105 keys
- Chatter threshold
- 5–200 ms (default 30 ms, gap < threshold)
- Chatter log
- last 20 events
- Keys not testable
- Tab, Escape, and keys the OS keeps (Fn, some media keys)
Features
- Keys identified by KeyboardEvent.code, so the physical key is shown whatever the language layout
- Last event: key, code, keyCode, location, modifiers and repeat
- Live held count and the most keys registered at once
- Keys outside the diagram are listed separately
- Only captures keys while the test area has focus
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