How to use
- 1
Press each key.
- 2
Check it turns green.
- 3
Hold several keys to see max rollover.
When to use it
Dead key
A key that never turns green is faulty.
Gaming keyboards
Test how many keys register at once.
Used laptops
Press every key before buying.
Good to know
- Keys that stay grey are not registering.
- Gaming keyboards should handle 6+ keys.
- Great for checking used laptops.
FAQ
Mac keyboards?
Yes; Command shows as Win.
Some keys missing?
OS-level keys may not reach the browser.
Stored?
No.