The Verdict
The most accurate wrist-based PPG device available, validated in clinical research. If accuracy is your priority but you can't tolerate a chest strap, Biostrap is the best option. The subscription adds ongoing cost.
Pros
- Clinical-grade PPG sensors
- Research-validated accuracy
- Detailed HRV analytics
- Sleep staging
Cons
- Shorter battery life
- Less known brand
- Subscription for best features
- Limited ecosystem
Clinical-Grade PPG
Biostrap uses red and infrared LEDs (rather than just green) for deeper tissue penetration and more accurate pulse detection. Multiple studies have validated its accuracy against medical-grade equipment.
Research Focus
Biostrap is used in clinical research settings, which speaks to its accuracy. The company provides raw data export for researchers, unusual for consumer devices.
Sleep Lab Quality
Sleep staging and respiratory rate tracking approach polysomnography (sleep lab) quality. If you want the most detailed sleep HRV data from a wrist device, Biostrap delivers.
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