Firstbeat technology is pro grade with near lab accuracy, measuring heart rate variability (HRV) using a professional grade sensor with electrocardiogram (ECG) technology, the gold standard in heart rate and heart rate variability measurements. Most wearables only measure heart rate (HR).
Instead of just monitoring, you see the connection between your reactions to daily events so you can make proactive choices about your health and well-being. While HR and HRV are controlled by your autonomic nervous system, HRV reveals a much more detailed picture of your physiological state both during activity and rest. Firstbeat assessments give a clear picture, with reporting including actionable insights.
The underlying data of wearables may not be accurate, as various things can throw off sensor readings, such as flexing muscles, wearing the device too loosely or skin pigmentation.