10 posts found
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.
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.
Most smart rings treat a 20-minute afternoon nap as either deep sleep or a complete miss. The reason is not a bug. It is a fundamental mismatch between how actigraphy guesses sleep stages and how naps actually work.
Most smart rings stop holding a full charge after 18 to 24 months, and the companies that sell them know it. The battery is sealed inside a titanium shell, glued shut, with no replacement path. That is not an accident. It is a business model.
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.
Consumer wearables run reflective PPG on body parts never designed for it. The FDA has scrutinized these monitors since 2022 for systematic bias. Smart rings compound the problem with clamp pressure and unvalidated algorithms.
The smart ring market is splitting into three species: premium health platforms, single-purpose tools, and subscription-hungry AI wrappers. Pebble's Index 01 proves the divergence is real.
Oura filed for IPO. RingConn got pulled from Amazon. Ultrahuman and Luna are banned in the US. A Reddit user asked if the no-subscription smart ring dream is dead. It is not. But the remaining options are smaller, founder-led, and built on economics that venture capital hates.
Most wearable APIs are not built for you. They are built for partners who build features that keep you subscribed. Here is how the data lock-in actually works, and how Pulsyn does the opposite.
