The consumer digital health sector is undergoing a structural transition from episodic, reactive vital sign tracking toward continuous, multimodal physiological synthesis and proactive longevity modeling. The hardware introduction of the Apple Watch Series 12 and Apple Watch Ultra 4, coupled with the architectural overhaul of the Apple Health application under iOS 27, marks a significant convergence of high-frequency wearable photoplethysmography, on-device computer vision, g

OpenAI's launch of Health in ChatGPT across the United States establishes a framework for grounding large language models (LLMs) in personal health data. By allowing users to link electronic health records (EHRs) and consumer wearables directly to their chat interface, the platform shifts from a generic health query tool into a contextualised digital health companion. This transition reflects broader structural strains within healthcare delivery, characterised by fragmented p