Posts tagged: Transparency

2 posts found

A close-up of a green LED and photodiode sensor on a small circuit board, the same components found inside every smart ring that claims to monitor your heart rate continuously

The 'Continuous' Heart Rate Lie: Why Your Ring Samples Your Pulse in Bursts, Not Streams

Smart rings claim 'continuous' heart rate monitoring. The physics of photoplethysmography and a 20 milliamp-hour battery make that impossible. Here is the duty cycle nobody talks about, and why Pulsyn shows the gaps instead of hiding them.

James Hoffmann

Jun 9, 2026 11 min read

An abstract visualization of the human nervous system and stress response, representing the complex physiology behind fabricated wearable stress scores

StressHrvWearables

Why Stress Scores Are the Most Fabricated Metric in Wearables

Every major wearable gives you a stress score between 0 and 100. That number is not a measurement. It is a proprietary blend of heart rate variability and secret sauce with no clinical definition. Pulsyn shows you the raw HRV and the context instead.

James Hoffmann

May 26, 2026 13 min read