Insights on health technology, privacy-first design, and the science behind smarter wearables.
Most wearables give you a health age or body age score that compares your biometrics to a population average. The math is a regression model, not a medical diagnosis. Pulsyn does not show one because the number is statistically invalid for the individual reading it.
Most smart ring manufacturers advertise 7-day battery life. That number comes from a test mode where the heart rate monitor is off and the wearer is asleep. In real use, the gap between marketing and physics is about 40 percent.
Your fitness tracker data is not protected by HIPAA. The FTC, Congress, and 20 states are trying to fix that, but legislation only regulates what companies can do with data they already possess. Pulsyn removes the server entirely.
Most health apps start with a login form because their business model requires your email before their product requires your data. Pulsyn starts with a heart rate graph because the app stores everything locally on your phone and has nothing to authenticate against.
Most wearables compute a stress score by running your heart rate through a black box. Pulsyn does the same thing, but the weights are public, the math is in the repository, and the app tells you exactly how confident it is. Here is the full breakdown.
Most wearables report resting heart rate as the lowest heart rate they can find, usually during sleep. The clinical definition is different. Pulsyn measures it during motionless awake periods, and the gap between the two definitions is often 10 to 15 beats per minute.
Smart rings promise workout tracking, but the physics of finger blood flow makes PPG nearly useless during exercise. Here is why the heart rate data is often fabricated, and why Pulsyn does not pretend otherwise.
A Reddit post called Cracked Oura hit 769 upvotes by showing how to bypass Oura's mandatory subscription using raw BLE data. The thread turned into a product support forum for a product Oura refused to build.
The first night effect is a documented neurological phenomenon where half your brain stays awake in unfamiliar environments. Most wearables treat this as a bad night and tank your score. They should be treating it as a different kind of night entirely.
