by Fitbit • Model: FB521
The Fitbit Sense 2 is an advanced health smartwatch designed to provide a holistic view of cardiovascular and emotional well-being. It features an FDA-cleared ECG app that allows users to assess their heart rhythm for Atrial Fibrillation (AFib) on demand. A standout feature is the Body Response (cEDA) sensor, which monitors continuous electrodermal activity to identify signs of stress, allowing users to correlate emotional triggers with heart rate variability and rhythm changes.
Est. Monthly Cost
$9.99/mo
Est. Yearly Cost
$369.83
(including device)
Eligibility may vary by provider and plan. Check with your HSA/FSA administrator for specific details.
Evidence-based evaluation by medical professionals
"The Fitbit Sense 2 is an excellent health companion for users who prioritize stress management and passive heart health monitoring over advanced smartwatch productivity."
The Fitbit Sense 2 is a refined health wearable that prioritizes long-term wellness tracking through its comprehensive sensor suite. Its primary clinical features include an FDA-cleared ECG app and an Irregular Heart Rhythm Notification (IHRN) system, both of which were validated in the massive Fitbit Heart Study. The device introduces the cEDA (continuous electrodermal activity) sensor, which passively monitors skin conductance throughout the day to identify 'Body Response' events related to stress. While its ECG app is a single-lead (Lead I) spot-check tool requiring user initiation, the IHRN system works passively in the background using PPG technology. Clinical validation studies have shown the IHRN system has a positive predictive value of 98.2% for detecting AFib during periods of inactivity. The Sense 2 also monitors blood oxygen (SpO2) and skin temperature variations overnight. While it lacks the third-party app ecosystem of Wear OS or watchOS, its 6-day battery life and focused health metrics make it a powerful tool for longitudinal health surveillance.
Ranked #4 of 7 clinically evaluated smartwatches with ecg devices
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Verified retailers and current pricing
FSA/HSA eligible; typically includes 6 months of Fitbit Premium for new users.
Frequently discounted; eligible for standard Amazon return policy.
5% RedCard savings available; in-store pickup available.
