App Freshness



Elliott McAllister
Old Grump™ – Reaction Test
Post Date:
2017-10-23 21:15:18

Download Old Grump™ – Reaction Test »

The Old Grump App is a reaction time test. Reaction time is the elapsed time between the presentation of a sensory stimulus and the subsequent behavioral response.

RT is fastest when there is only one possible response (simple reaction time) and becomes slower as additional response options are added. The Old Grump sways from side to side making different faces, (choice reaction time) when you see him smile hit the play button as fast as you can. The Old Grump gives you your RT in milliseconds.

Reaction time is quickest for young adults and gradually slows down with age. It can be improved with practice, up to a point. Use the Old Grump to improve your RT or to simply see if you still have it!

The Old Grump stores your best time locally on the homescreen where you can also log in and out of Facebook, write messages and post your record RT to your Wall and friends’ home pages!

Fully updated for iOS 4 Multi-Tasking, & iPhone 4 retina Display.

Accompanied with new funky background music…

…Catch him if you can!


  • Old Grump™ – Reaction Test Screenshot
  • Old Grump™ – Reaction Test Screenshot

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