Email id: pankhurivairagade02@gmail.com ABSTRACT 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 limitations. To overcome this, a 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 19-25 years. For concurrent 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.