Withings ScanWatch 2 vs Apple Watch Ultra 2 - Clinical Comparison

Name: Apple Watch Ultra 2
Brand: Apple
Price: 799 USD
Rating: 94

Compare Withings ScanWatch 2 and Apple Watch Ultra 2 side-by-side with clinical performance scores, FDA status, pricing, and expert recommendations

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Withings ScanWatch 2

93 /100

Apple Watch Ultra 2

94 /100

+1% higher overall score

Withings ScanWatch 2

Withings

Score

Price

$350

Evidence

Strong

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Top Rated

Apple Watch Ultra 2

Apple

Score

Price

$799

Evidence

Strong

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Performance Metrics

Withings ScanWatch 2

Apple Watch Ultra 2

Performance Metrics

Withings ScanWatch 2

Apple Watch Ultra 2

ECG Accuracy

Measures how closely the device's rhythm recordings match clinical gold-standard ECG machines.

In clinical trials, the device achieved 96.3% sensitivity for AFib and 100.0% specificity for sinus rhythm, though 19.5% of real-world recordings may be inconclusive.

The single-lead ECG app provides diagnostic-quality waveforms with high correlation to clinical Lead I recordings, meeting FDA requirements for rhythm classification.

+2% better ecg accuracy

ECG Accuracy

Measures how closely the device's rhythm recordings match clinical gold-standard ECG machines.

+2% better

Ease of Use

Evaluates the simplicity of the hardware interface and the physical process of taking a reading.

On-demand ECG measurements are performed simply by touching the stainless steel bezel for 30 seconds, with results displayed instantly on the watch's OLED screen.

Recording an ECG is as simple as placing a finger on the Digital Crown for 30 seconds, with intuitive haptic feedback and clear on-screen instructions.

+3% better ease of use

Ease of Use

Evaluates the simplicity of the hardware interface and the physical process of taking a reading.

+3% better

Health Feature Set

Assesses the breadth and depth of available health monitoring tools, including sensors and alerts.

Integrates ECG, SpO2, continuous temperature tracking, and respiratory rate monitoring alongside standard activity and sleep tracking.

Includes ECG, SpO2, heart rate variability, sleep stages, temperature tracking, and advanced fall/crash detection.

+5% better health feature set

Health Feature Set

Assesses the breadth and depth of available health monitoring tools, including sensors and alerts.

+5% better

Value for Money

Compares the device's features and clinical utility against its market price and subscription costs.

Offers medical-grade sensors and exceptional battery life at a competitive price, with an optional but not mandatory Withings+ subscription for advanced insights.

+5% better value for money

While it carries a premium price, the combination of professional-grade health sensors and military-grade durability offers significant long-term value for active users.

Value for Money

Compares the device's features and clinical utility against its market price and subscription costs.

+5% better

Clinical Efficacy

Withings ScanWatch 2

Apple Watch Ultra 2

Clinical Efficacy

Withings ScanWatch 2

Apple Watch Ultra 2

AFib Detection Accuracy

The accuracy of the device in correctly identifying Atrial Fibrillation.

Clinical studies yielded 96.3% sensitivity and 100.0% specificity; public database testing showed sensitivity as high as 99.06%.

Clinical validation shows 98.3% sensitivity for AFib detection and 99.6% specificity for normal sinus rhythm classification.

+2% better afib detection accuracy

AFib Detection Accuracy

The accuracy of the device in correctly identifying Atrial Fibrillation.

+2% better

Heart Rate Monitoring Accuracy

The precision of heart rate tracking during rest and physical activity.

The multi-channel PPG sensor achieved a QRS complex detection F1-score of 99.19% in clinical datasets.

+3% better heart rate monitoring accuracy

The high-performance PPG sensor provides heart rate data that tracks closely with chest-strap heart rate monitors during aerobic exercise.

Heart Rate Monitoring Accuracy

The precision of heart rate tracking during rest and physical activity.

+3% better

SpO2 Measurement Accuracy

How closely blood oxygen readings match medical-grade pulse oximeters.

Clinically validated for spot-checking SpO2 levels; however, factors like motion and tattoos can affect individual readings.

Reliable for trending and wellness checks, though sensitivity to wrist movement and skin perfusion can impact absolute accuracy compared to clinical-grade sensors.

+2% better spo2 measurement accuracy

SpO2 Measurement Accuracy

How closely blood oxygen readings match medical-grade pulse oximeters.

+2% better

Health Alert Reliability

The dependability of automated alerts for irregular rhythms or high/low heart rates.

Provides proactive notifications for temperature shifts and heart rate anomalies (non-US only for irregular rhythm notifications).

The Irregular Rhythm Notification system is highly reliable for detecting sustained AFib patterns over time, though it is not designed for real-time monitoring of every event.

+2% better health alert reliability

Health Alert Reliability

The dependability of automated alerts for irregular rhythms or high/low heart rates.

+2% better

Specifications

Specification	Withings ScanWatch 2	Apple Watch Ultra 2
Price	$350	$799
FDA Status	FDA 510(k) Cleared	FDA 510(k) Cleared
Clinical Evidence	Strong Clinical Evidence	Strong Clinical Evidence
Clinical Recommendation	Highly Recommended	Highly Recommended
Connectivity	bluetooth	bluetooth wifi nfc cellular

Value for Money

93 score / $350

26.6

value score

126% better value

94 score / $799

11.8

value score

Value score = Performance score ÷ Price × 100

Withings ScanWatch 2

Strengths

✓ Incredible 35-day battery life reduces charging anxiety and improves data continuity
✓ FDA-cleared single-lead ECG with high clinical specificity (100.0%)
✓ Continuous 24/7 temperature monitoring for early illness detection
✓ Elegant analog design suitable for formal and professional settings
✓ Comprehensive PDF reporting for medical-grade data sharing with doctors

Limitations

× Approximately 19.5% of ECG recordings may be deemed inconclusive in clinical settings
× Small 0.63-inch grayscale OLED display may be difficult for some to read
× Irregular heart rhythm notifications are currently not available for US users

Apple Watch Ultra 2

Strengths

✓ FDA-cleared ECG app with high diagnostic sensitivity
✓ Extreme durability with a WR100 water resistance rating (100m)
✓ Comprehensive irregular rhythm notification (IRNF) system
✓ Brightest Apple Watch display (3000 nits) for outdoor visibility
✓ Long battery life (up to 36 hours) for extended health tracking

Limitations

× ECG app is not intended for users under the age of 22
× Large 49mm case may be bulky on smaller wrists
× Premium price point compared to standard health wearables

Expert Review Summary

Our clinical assessment and verdict for each device

Withings ScanWatch 2

Highly Recommended

"A sophisticated hybrid watch that bridges the gap between traditional aesthetics and advanced medical-grade health surveillance, featuring an industry-leading 35-day battery life."

The Withings ScanWatch 2 (Model HWA10) is a premier hybrid smartwatch that integrates advanced clinical sensors into a timeless analog design. Its core medical utility centers on the Scan Monitor, which is FDA-cleared for recording single-lead ECG rhythms to detect Atrial Fibrillation (AFib). Clinical validation in a study of 262 subjects demonstrated a 96.3% sensitivity for AFib detection and 100.0% specificity for normal sinus rhythm. Beyond its EKG capabilities, the device features the TempTech 24/7 module, which uses a heat-flux sensor and a temperature sensor to provide continuous baseline temperature variations. It also passively monitors for irregular heart rhythms via a multi-channel PPG sensor and tracks blood oxygen (SpO2) levels. Designed for health-conscious adults (22+ in the U.S.), the ScanWatch 2 offers a 'spot-checking' approach to health monitoring, providing professional-grade PDF reports for easy data sharing with clinicians. While its grayscale OLED screen is minimal, its 35-day battery life ensures near-continuous health data collection that few other smartwatches can match.

Strong Clinical Evidence

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Apple Watch Ultra 2

Highly Recommended

"A powerhouse wearable that seamlessly integrates high-fidelity cardiac screening into a ruggedized, multi-sport platform."

The Apple Watch Ultra 2 represents the pinnacle of consumer health wearables, offering a robust suite of sensors housed in an aerospace-grade titanium chassis. Its primary clinical utility centers on the FDA-cleared ECG app, which utilizes a single-lead (Lead I) electrical heart sensor integrated into the Digital Crown. Clinical trials for the ECG app demonstrated a 99.6% specificity in classifying sinus rhythm and 98.3% sensitivity in detecting Atrial Fibrillation (AFib) for classifiable recordings. Beyond spot-checks, the device features an Irregular Rhythm Notification (IRNF) system that passively monitors pulse intervals via the optical heart sensor (PPG), alerting users to potential undiagnosed AFib. The Ultra 2 also includes a blood oxygen (SpO2) sensor and a temperature sensor for cycle tracking and sleep health. While the manual emphasizes that these features are not intended for medical diagnosis, the high correlation between the Ultra 2's data and clinical-grade equipment makes it a vital tool for longitudinal health surveillance in active populations.

Strong Clinical Evidence

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Where to Buy

Verified purchase options and current availability

Withings ScanWatch 2

$350 MSRP

Withings Direct

$349.95

3-5 business days FSA/HSA eligible; includes 1-year limited warranty.

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Amazon

$349.95

1-2 days (Prime) Free shipping and returns; often available with bundled accessories.

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Best Buy

$349.99

Same-day pickup In-store demonstration available in select locations.

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Manufacturer Site

HSA/FSA: Usually Eligible

Apple Watch Ultra 2

Top Choice

$799 MSRP

Amazon

$549.00

1-2 days Lowest current market price as of March 2026; FSA/HSA eligible.

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Best Buy

$599.00

Same-day pickup Refurbished units often available starting at $419.99.

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Apple Store

$799.00

3-5 days Official MSRP; eligible for Apple Trade-In program.

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Manufacturer Site

HSA/FSA: Usually Eligible

Important 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.