Withings ScanWatch 2 (HSAT) vs NightOwl Home Sleep Apnea Test - Clinical Comparison
Compare Withings ScanWatch 2 (HSAT) and NightOwl Home Sleep Apnea Test 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) | NightOwl Home Sleep Apnea Test |
|---|---|---|
| Price | $350 | $99 |
| 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
|
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].
NightOwl Home Sleep Apnea Test
Strengths
- ✓ The smallest and most discrete home sleep apnea test on the market.
- ✓ Multi-night recording capability (up to 10 nights) provides higher diagnostic confidence.
- ✓ No nasal cannula or chest belts, allowing for natural sleep patterns.
- ✓ Seamless integration with ResMed's clinical ecosystem (Somnoware/myAir).
- ✓ Fully disposable design eliminates the need for cleaning or device returns.
Limitations
- × Mandatory smartphone requirement; not suitable for users without compatible devices.
- × Not indicated for central sleep apnea or complex cardiovascular comorbidities.
- × Limited ability to detect non-respiratory sleep disorders like RLS or parasomnias.
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].
NightOwl Home Sleep Apnea Test
"The most compact and non-invasive diagnostic sleep test available, offering the unique advantage of multi-night testing in a disposable format."
NightOwl, developed by Ectosense and acquired by ResMed, is currently the world's smallest FDA-cleared home sleep apnea test (HSAT). Measuring roughly the size of a fingertip, the sensor is applied via a simple adhesive patch and communicates directly with a smartphone app. Unlike traditional Type III tests that require chest belts and nasal cannulas, NightOwl utilizes Peripheral Arterial Tone (PAT) technology combined with actigraphy and advanced photoplethysmography (PPG). This combination allows it to derive accurate respiratory event indices (REI) and total sleep time (TST). Its most significant clinical advantage is the ability to record for up to 10 nights, allowing clinicians to capture night-to-night variability and avoid misdiagnosis based on a single 'off' night. Our clinical assessment confirms its high correlation with gold-standard polysomnography (PSG), particularly in its 4% hypopnea desaturation scoring accuracy.
Where to Buy
Verified purchase options and current availability
Withings ScanWatch 2 (HSAT)
Withings Official Store
$349.95Best Buy
$349.99NightOwl Home Sleep Apnea Test
Top ChoiceSleeplay
$99.00HomeSleepHealth
$90.00Important 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.