Free
In-App Purchases
About
Test your reaction – Greenhill Reaction Check
How fast can you react? Find out with the Greenhill Reaction Check app! This app measures your reaction speed and helps you train your reflexes. Perfect for anyone who wants to improve their focus and quickness.
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What's New in Greenhill Reaktion Check
1.0.3
February 16, 2026
Sharing function added
1
In-App Purchases
$2.99
Unlimited Measurements
Unlimited Measurements
