INTRODUCTION: Shoulder range of motion (ROM) assessment is vital for the follow-up evaluation of the operated patients and the outcome-based research studies. The aim of this study was to investigate the accuracy and reliability of a remote on-screen application(app)-based method of shoulder ROM measurement through telehealth medium. MATERIAL AND METHODS: A consultant shoulder surgeon, a board-certified orthopedic resident and a medical graduate doctor served as the examiners. The cohort consisted of 24 healthy volunteers and 16 symptomatic patients with expectant shoulder ROM deficits. The shoulder ROM was first examined physically using the goniometer in the clinic and then over the Zoom remote conferencing using the protractor extension app of the chrome browser. RESULTS: Instrument validity was examined by comparing the goniometer method with the protractor app-based method of the expert shoulder consultant using Bland-Altman analysis. It showed only minor mean differences for the healthy volunteers and the patients: elevation (2.0 degrees ,5.0 degrees ), abduction (2.0 degrees ,3.0 degrees ), external rotation with elbow adducted (ER1) (1.9 degrees ,0.2 degrees ), external rotation with elbow abducted at 90 degrees (ER2) (0.4 degrees ,4 degrees ) and internal rotation with elbow abducted at 90 degrees (IR) (2.3 degrees ,1.2 degrees ) respectively; with their limits of agreement (LOA) that were below the well-established minimum clinically important differences (MCID) values. The intraclass coefficient correlation (ICC) values varied between 0.83 and 096 for volunteers and between 0.90 and 0.98 for the patients, which meant an excellent correlation between the two methods. The interobserver reliability between two examiners for the protractor app-based method as evaluated by ICC scores was excellent. It ranged between 0.86 to 0.98 for the volunteers and between 0.88 to 0.99 for the patients. Comparison of the protractor app-based method with the gold standard goniometer method for the resident and the graduate doctor showed excellent ICC values. CONCLUSION: Protractor app-based method of measuring shoulder ROM over telehealth medium is accurate and reliable compared to the clinical goniometer method. This validated method can be used during remote telehealth consultation with significant benefits of saving patients travel and time during COVID-19 and even later.