Purpose: This study aimed to examine the practicality and dependability of the painometer application's Numeric Rating Scale (NRS) for evaluating pain intensity, in comparison to the conventional NRS method. Objective: This study aimed to assess the effectiveness of an Android application as a tool for measuring pain intensity in patients with low back pain. Methodology: This study employs a descriptive research approach, with a sample size consisting of 59 patients. Analysis: Interclass correlation coefficients were employed to assess the Painometer application's efficacy on an Android phone for detecting pain intensity. Additionally, the Bald Altman plot was utilized to evaluate the agreement between the two scales. Conclusion: The Painometer application demonstrates strong reliability and agreement among both individual testers and different testers. Therefore, it can effectively quantify the level of pain.