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Posts tagged: On Device Ai

5 posts found

Prescription medication pills on a dark surface, representing GLP-1 drugs like Ozempic and Wegovy
Heart RateOn Device AiHrv

What GLP-1 Drugs Do to Your Smart Ring's Readings

GLP-1 drugs like Ozempic and Wegovy increase your resting heart rate by 2-5 bpm, lower HRV, and change skin temperature. Here is how that breaks every wearable algorithm and why your recovery score is lying to you.

James Hoffmann James Hoffmann
Jun 23, 2026 1 min read
A person wearing a smart ring while sleeping, with a digital overlay showing temperature and heart rate data patterns used for early illness detection
On Device AiSkin TemperatureSleep Tracking

Can Your Smart Ring Detect Illness Before You Feel Symptoms

A March 2026 Nature study found that sleep and temperature data from consumer wearables can detect diabetes with 73% accuracy. The sensors are already in your smart ring. The companies selling them are not using them for this.

James Hoffmann James Hoffmann
Jun 13, 2026 1 min read
A medical sleep study room with monitoring equipment and sensors, the gold standard for measuring sleep stages that smart rings attempt to approximate
Sleep ScienceOuraWhoop

How Smart Rings Calculate Sleep Stages (and Why They're Mostly Guessing)

Your smart ring does not measure sleep stages. It measures heart rate and motion, then guesses. Here's how the guess works, why the industry pretends otherwise, and why Pulsyn tells you the truth.

James Hoffmann James Hoffmann
Jun 8, 2026 14 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 James Hoffmann
May 25, 2026 13 min read
Cloud server infrastructure with blue lighting
Local FirstPrivacyOn Device Ai

Why Your Health Data Doesn't Need a Cloud

Every smart ring app ships your biometric data to a server before showing you your own sleep score. The cloud isn't there for your convenience. It's there for their business model.

James Hoffmann James Hoffmann
May 21, 2026 11 min read