Grellow app for iPhone and iPad
4.7 (
4937 ratings )
Health & Fitness
Education
Developer: Jacob Zeitlin
Free
Current version: 1.0, last update: 7 years agoFirst release : 04 Feb 2015
App size: 405.21 Kb
Test your reflexes with Grellow, a brain-training app. See how long it takes you to react to a change in color, and watch your reaction time improve as you use the app!