Mobile health apps for QT interval measurement: A systematic review

Background: The QT interval, which reflects ventricular electrical activity, is a key marker for assessing the risk of life-threatening ventricular arrhythmias and sudden cardiac death. Mobile health applications (mHAs) have recently been developed to facilitate QTc measurement; however, these apps show considerable variation in quality and functionality, and many need clinical validation. Methods: We conducted a systematic review and evaluated QTc-focused mHAs across Apple iOS, Google Play, and Microsoft Store. Eligible apps that incorporated validated QTc correction formulas, such as Bazett, Fridericia, or Framingham, were available in English or Spanish. Quality and functionality were assessed using the Mobile App Rating Scale (MARS) and IMS criteria. Results: Of the 88 initially identified apps, 12 met the inclusion criteria. The highest MARS and functionality scores were achieved by “EP QTc by EP Studios,” noted for its range of QTc correction formulas, followed by “QTc-Calculator by Marian Stiehler.” Overall, apps showed significant variability in quality, indicating a lack of standardized features across platforms. Conclusion: This review highlights the variability in QTc-focused mHAs and the need for rigorous evaluation. Although these apps could enhance arrhythmia monitoring, few meet the standards necessary for clinical practice, emphasizing the importance of validation before integration into healthcare settings.