Withings ScanWatch 2 (HSAT) vs Withings Sleep Analyzer - Clinical Comparison
Compare Withings ScanWatch 2 (HSAT) and Withings Sleep Analyzer side-by-side with clinical performance scores, FDA status, pricing, and expert recommendations
Performance Metrics
Performance Metrics
Diagnostic Accuracy
Measures how closely the device's findings match clinical gold standards like PSG or 12-lead ECG.
Diagnostic Accuracy
Measures how closely the device's findings match clinical gold standards like PSG or 12-lead ECG.
Ease of Use
Evaluates the simplicity of setup, data sync, and interface navigation.
Ease of Use
Evaluates the simplicity of setup, data sync, and interface navigation.
Wearing Comfort
Assesses how comfortable the device is for long-term wear, particularly during sleep.
Wearing Comfort
Assesses how comfortable the device is for long-term wear, particularly during sleep.
Value for Money
Compares the feature set and longevity against the upfront and ongoing costs.
Value for Money
Compares the feature set and longevity against the upfront and ongoing costs.
Clinical Efficacy
Clinical Efficacy
AHI Detection Accuracy
Measures accuracy in identifying Apnea-Hypopnea Index levels.
AHI Detection Accuracy
Measures accuracy in identifying Apnea-Hypopnea Index levels.
Sleep Stage Identification
Assesses the accuracy of identifying REM, Light, and Deep sleep states.
Sleep Stage Identification
Assesses the accuracy of identifying REM, Light, and Deep sleep states.
Respiratory Event Detection
Evaluates accuracy in detecting individual breathing disturbances.
Respiratory Event Detection
Evaluates accuracy in detecting individual breathing disturbances.
In-Lab PSG Correlation
Measures how the device results correlate with in-lab polysomnography.
In-Lab PSG Correlation
Measures how the device results correlate with in-lab polysomnography.
Specifications
| Specification | Withings ScanWatch 2 (HSAT) | Withings Sleep Analyzer |
|---|---|---|
| Price | $350 | $200 |
| FDA Status | FDA 510(k) Cleared | FDA 510(k) Cleared |
| Clinical Evidence | Strong Clinical Evidence | Strong Clinical Evidence |
| Clinical Recommendation | Recommended | Highly Recommended |
| Connectivity |
bluetooth
|
bluetooth
wifi
|
Value for Money
Withings ScanWatch 2 (HSAT)
Strengths
- ✓ Industry-leading 30-day battery life on a single charge[cite: 1004].
- ✓ FDA-cleared single-channel ECG rhythms for AFib detection[cite: 947, 950].
- ✓ Durable construction with stainless steel or titanium electrodes[cite: 1001].
- ✓ Generates clinical-ready PDF reports for easy sharing with physicians[cite: 1000].
- ✓ Automatic background pulse rate monitoring for irregular heart rhythms[cite: 838].
Limitations
- × Approximately 19.5% of ECG recordings may be classified as inconclusive in real-world settings[cite: 1014].
- × Restricted to adult use (22+ years in the U.S. for clinical features)[cite: 971].
- × Not recommended for users with cardiac pacemakers or other known arrhythmias besides AFib[cite: 841, 965].
Withings Sleep Analyzer
Strengths
- ✓ FDA-cleared for obstructive sleep apnea (OSA) diagnosis support in adults.
- ✓ Completely contactless operation requires zero user maintenance after initial setup.
- ✓ Clinically validated heart rate monitoring through ballistocardiography.
- ✓ Generates shareable medical PDF reports for direct clinician review.
- ✓ FSA and HSA eligible, improving financial accessibility for medical screening.
Limitations
- × Requires an electrical outlet near the bed and stable Wi-Fi for data sync.
- × Limited to monitoring one person per mat; partner movements may occasionally interfere.
- × Not indicated for active monitoring or life-threatening situations due to lack of alarms.
Expert Review Summary
Our clinical assessment and verdict for each device
Withings ScanWatch 2 (HSAT)
"The premier choice for users seeking a traditional timepiece that doubles as an FDA-cleared, long-term cardiac and sleep monitoring tool[cite: 836, 947]."
The Withings ScanWatch 2 (Model HWA10) is a sophisticated medical accessory that disguises its clinical capabilities within a hybrid analog design[cite: 834, 835]. It is primarily indicated for recording single-channel ECG rhythms and detecting Atrial Fibrillation (AFib) in adult patients[cite: 949, 950]. In clinical validation studies involving 262 subjects, the watch demonstrated a 96.3% sensitivity for AFib and 100% specificity for normal sinus rhythm on conclusive recordings, although 19.5% of strips were classified as inconclusive[cite: 1013, 1014]. Beyond cardiac care, the device tracks sleep duration and architecture, including light, deep, and REM stages, through its integrated photoplethysmography (PPG) and accelerometer sensors[cite: 836, 1179]. Its hardware construction is notably durable, utilizing stainless steel or titanium electrodes and a design rated for 30 days of typical use on a single charge[cite: 1001, 1004]. While it offers 'set-and-forget' convenience for heart and sleep health, it remains an informational screening tool rather than a diagnostic replacement[cite: 994, 995].
Withings Sleep Analyzer
"The premier non-wearable solution for long-term sleep apnea screening and cardiac monitoring, combining medical-grade accuracy with zero user burden."
The Withings Sleep Analyzer (marketed as Sleep Rx in the U.S. for clinical applications) represents a shift in home sleep diagnostics by eliminating the need for wearables. Placed discreetly under the mattress, it utilizes advanced pneumatic sensors to measure heart activity via ballistocardiography (BCG), respiratory rate, and body movement, while an embedded microphone identifies snoring and breathing cessation events. Clinical validation studies, including those conducted at Hôpital Béclère, demonstrated that its 'Withings Index' matches gold-standard polysomnography (PSG) with 88% sensitivity and 88.6% specificity for moderate-to-severe sleep apnea (AHI ≥ 15). The device is particularly effective for longitudinal monitoring, as its passive nature ensures high patient adherence over months rather than just a single night. While it lacks the direct brain-wave tracking of EEG-based devices, its ability to provide shareable clinical PDF reports and integrate with smart home environments through IFTTT makes it an exceptionally versatile tool for both patients and clinicians.
Where to Buy
Verified purchase options and current availability
Withings ScanWatch 2 (HSAT)
Withings Official Store
$349.95Best Buy
$349.99Withings Sleep Analyzer
Top ChoiceWithings Official Store
$199.95Amazon
$199.95Best Buy
$199.95Important Purchase Considerations
- • Prices shown are current as of the last update and may vary. Always verify pricing at the retailer's website.
- • Some medical devices may require a prescription. Check with your healthcare provider before purchasing.
- • Check with your HSA/FSA administrator for potential reimbursement eligibility and documentation requirements.
- • Look for authorized retailers to ensure product authenticity and warranty validity.