Sky Labs, a health-tech startup based in South Korea, developed CART BP—the world’s first ring-shaped, cuffless device designed for 24-hour blood pressure monitoring. Unlike conventional smartwatches, CART BP delivers more stable photoplethysmography (PPG) signals, ensuring highly accurate blood flow measurements through the finger. Wrist-based devices often struggle with accuracy due to variations in wrist size and sensor positioning. In contrast, CART BP offers multiple ring sizes for a customized fit, significantly improving measurement precision. Its accuracy has been rigorously validated in clinical trials.

The ISH position paper, endorsed by leading organizations such as the World Hypertension League (WHL), the European Society of Hypertension (ESH), the Asian Pacific Society of Hypertension (APSH), and the Latin American Society of Hypertension (LASH), highlights CART BP’s promising results from multiple clinical trials. Based on these studies, the paper confirms that CART BP meets International Organization for Standardization (ISO) standards and closely correlates with conventional Ambulatory Blood Pressure Monitoring (ABPM) systems.