Posts tagged: Health Ai

2 posts found

An ECG waveform diagram showing the difference between normal sinus rhythm and the chaotic irregular pattern of atrial fibrillation, illustrating what smart rings try to detect with PPG sensors

Your Smart Ring's AFib Detection Is Not Medical Grade. Here Is What It Actually Measures.

Smart rings use PPG sensors to detect patterns that may suggest atrial fibrillation. But PPG-based AFib detection is not medical-grade diagnosis. Here is how it works, what the accuracy actually looks like, and why the Circular Ring 2 with real ECG is the exception.

James Hoffmann

Jun 26, 2026 1 min read

A close-up of a smartphone processor chip, the same hardware that runs Pulsyn's on-device health AI without ever sending your biometrics to a server

On Device AiPrivacyHealth Ai

How On-Device AI Actually Works: Why Your Health Data Never Leaves Your Phone

On-device AI means your health data never leaves your phone. Here is the architecture, the constraints, and why it makes subscriptions unnecessary.

James Hoffmann

May 25, 2026 13 min read