Google Unveils PHRM to Track Heart Rate via Phone Camera With 6.09% Error
Updated
Updated · Google Research · Jun 4
Google Unveils PHRM to Track Heart Rate via Phone Camera With 6.09% Error
3 articles · Updated · Google Research · Jun 4
Summary
Google Research said its PHRM system can passively estimate heart rate from 8-second facial videos captured after face unlocks, then derive daily resting heart rate during normal smartphone use.
6.09% was PHRM’s overall heart-rate error in a 101-person free-living validation set after confidence gating, and 4.39 bpm was its resting-heart-rate error versus a Fitbit Charge 6.
350,000 video clips from nearly 700 participants trained the model, with skin-tone quotas and a non-inferiority target designed to keep accuracy gaps across groups below 5 percentage points.
15 leading rPPG models were outperformed by PHRM, which Google said was the only method to stay below 10% heart-rate error across all skin tones in both lab and real-world tests.
5 billion smartphone owners are the long-term target market, though Google said measurement success still drops for darker skin tones and can be disrupted by talking or head motion.
How will our biometric privacy be protected as smartphone cameras become passive health monitors?
As AI health software constantly evolves, how can regulators guarantee its safety and reliability long-term?
Beyond technical accuracy, how will this AI tool actually reach the world's most vulnerable populations?
Google's Passive Heart Rate Monitoring (PHRM): Smartphone-Based, AI-Driven, and Inclusive Cardiovascular Tracking Unveiled in 2026
Overview
Google's Passive Heart Rate Monitoring (PHRM) system, unveiled in June 2026, marks a major leap in smartphone-based health tracking. By passively using the phone’s front-facing camera whenever the screen is unlocked, PHRM collects heart rate and resting heart rate data throughout the day—no wearables or user action needed. This effortless, background monitoring transforms how people track their cardiovascular health, making it more accessible and integrated into daily life. The system’s seamless operation and focus on inclusivity set a new standard for personal health insights directly from smartphones.