Fourth Frontier

Fourth Frontier develops connected wearable devices for continuous cardiac health monitoring, offering products for both fitness enthusiasts and clinical applications. The company's flagship consumer device, Frontier X2, is a smart heart monitor that provides 24/7 continuous ECG tracking for cyclists, runners, triathletes, and other fitness enthusiasts, enabling them to train smarter and safer. It features vibration alerts to prevent overexertion, detailed performance and recovery insights including VO2 Max, heart rate variability, and readiness scores, and seamless integration with Apple Health, Strava, and Garmin. For clinical use, the company offers Frontier X Plus, a prescription-based, FDA-cleared continuous ambulatory ECG device that helps patients detect atrial fibrillation, bradycardia, tachycardia, and other arrhythmias through long-term home monitoring. The Frontier X Plus features a comfortable chest-worn design without wires or adhesives, shareable ECG data with weekly reports for timely clinical intervention, and early AFib detection with arrhythmia burden quantification. Fourth Frontier also provides next-generation Holter monitoring services with live streaming ECG, streamlined clinical review, and seamless EHR connectivity, as well as virtual cardiac rehabilitation solutions powered by continuous ECG insights that enable clinicians to monitor patient progress, ensure safety, and personalize recovery protocols. Founded in 2016 and headquartered in Austin, United States, Fourth Frontier has raised $15.1M in Series B funding from investors including Baring Private Equity Partners, Smiti Holding And Trading Company, and Asiana Fund.