Tech Doctor Inc. (Head Office: Chuo-ku, Tokyo; Representative Director: Kazunobu Minato; hereinafter referred to as Tech Doctor) has conducted a comparative verification of simultaneous wearing of the new wearable device "Fitbit Air®" released by Google Inc. with existing Fitbit devices (Charge6, Inspire3, Charge5), and an evaluation of data differences accompanying the migration to the Google Health app. In clinical research utilizing wearable devices, the characteristics of acquired data may change due to device model changes, or updates to sensors, algorithms, and applications. Therefore, continuous data quality evaluation (validation) is an extremely important process for ensuring the reliability of research results in long-term studies or when comparing with past data. In this verification, high consistency was confirmed for key indicators such as heart rate, resting heart rate, steps, calories burned, and sleep-related metrics between Fitbit Air and existing Fitbit devices. On the other hand, systematic differences (deviations) between models were also confirmed for SpO2 and some physiological indicators, indicating that careful evaluation for each indicator is necessary when changing devices. Through its track record of supporting over 100 research projects utilizing commercially available wearable devices, Tech Doctor continuously evaluates the impact of changes in devices and platforms on research data. Moving forward, we will continue to promote quality verification and evaluation activities to support the use of reliable data in the development of digital biomarkers and clinical research. ◼️ Background of Verification In recent years, clinical research using wearable devices has been expanding, particularly among pharmaceutical companies and academia. However, commercially available wearable devices are continuously updated with new models, improvements to sensors and algorithms, and changes to application specifications. While these changes contribute to