Grellow app for iPhone and iPad

4.7 ( 4937 ratings )

Health & Fitness Education
Developer: Jacob Zeitlin

Free

Current version: 1.0, last update: 8 years ago
First 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!