Background:Reaction time is an important indicator of neuromuscular status in any age group. Drop ruler test (DRT) is a commonly used measure to estimate reaction time, it has certain simple, portable and convenient App based measurement of reaction time is validated and reliability is checked. Method:The study was conducted on 93 individuals between the age group of 19 validity reaction time was measured using Drop Ruler Test by examiner A. Reaction time was measured using Reaction time Application by examiner A and examiner B. Results:Reaction time Application correlated strongly with Drop Ruler Test r=0.790 (p<0.001) Conclusion:Application based measurement of Reaction time is a valid measure and showed acceptable test retest reliability and therefore can be used clinically as an assessment tool. Keywords:Drop Ruler Test, Reaction time Application, Reaction time.