Withings ScanWatch vs Apple Watch: Clinical PPG and ECG Compared
Withings ScanWatch and Apple Watch both offer FDA-cleared ECG with AFib detection, but take vastly different design approaches. ScanWatch maintains a traditional analog watch aesthetic with medical-grade sensors hidden beneath, while Apple Watch embraces full digital smartwatch functionality. For users prioritizing clinical-grade health monitoring in an everyday watch, this comparison reveals how the PPG and ECG capabilities truly compare.
Specifications Comparison
| Specification | Withings ScanWatch 2 | Apple Watch (Series 10) |
|---|---|---|
| PPG Sensor | Multi-wavelength LED (green, red, IR), photodiode array | Custom 4-cluster green LED, 4 photodiodes, red/IR |
| Sampling Rate | 25 Hz | Adaptive (5 min rest, continuous workout) |
| LED Wavelengths | Green 525 nm, Red 660 nm, IR 940 nm | Green 520 nm, Red 660 nm, IR 940 nm |
| Battery Life | 30 days | 18 hours |
| Price | $349 | $399–$499 |
| Weight | 39 g (38 mm), 58 g (42 mm) | 36–39 g |
| Water Resistance | 5 ATM (50 m) | WR50 (50 m) |
| SpO2 | Yes, medical-grade (ISO 80601-2-61) | Yes, Blood Oxygen (wellness-grade) |
| ECG | Yes, FDA-cleared single-lead | Yes, FDA-cleared single-lead |
| Respiratory Rate | Yes, PPG-derived (clinically validated) | Yes, during sleep |
Pros & Cons
Withings ScanWatch 2
Pros
- + Classic analog watch design appeals to users who dislike smartwatch aesthetics
- + FDA-cleared ECG and medical-grade SpO2 (ISO 80601-2-61 validated)
- + 30-day battery life eliminates charging anxiety for continuous monitoring
- + Clinically validated respiratory rate detection via PPG
Cons
- - Small OLED sub-display limits data visualization and interaction
- - No GPS for outdoor activity tracking
- - Limited smartwatch features (no apps, limited notifications)
Apple Watch (Series 10)
Pros
- + Full smartwatch with apps, notifications, cellular, and GPS
- + Largest clinical validation dataset for consumer wearable ECG
- + Irregular rhythm notification monitors continuously for AFib
- + Comprehensive health ecosystem with HealthKit data sharing
Cons
- - 18-hour battery requires daily charging
- - SpO2 is wellness-grade, not clinically validated to ISO standards
- - Digital smartwatch aesthetic not suitable for all dress codes
Verdict
Withings ScanWatch 2 is the superior choice for users who want clinical-grade health monitoring in a traditional watch form factor, offering medical-grade SpO2 (ISO 80601-2-61 validated) that Apple Watch cannot match, plus 30-day battery life for uninterrupted monitoring. Apple Watch provides a more comprehensive health platform with continuous AFib monitoring, fall detection, GPS, and full smartwatch capabilities. For pure clinical PPG and SpO2 accuracy, Withings has the edge; for overall health monitoring breadth and ecosystem, Apple Watch remains the leader.
Frequently Asked Questions
Is Withings ScanWatch SpO2 more accurate than Apple Watch?
Yes. Withings ScanWatch SpO2 is validated to ISO 80601-2-61 medical pulse oximetry standards, making it a clinically-recognized measurement tool. Apple Watch Blood Oxygen is classified as a wellness feature without medical-grade validation. For users monitoring respiratory conditions, Withings provides more reliable SpO2 data.
Which has better ECG: Withings ScanWatch or Apple Watch?
Both offer FDA-cleared single-lead ECG with AFib detection. Apple Watch's irregular rhythm notification continuously monitors for AFib in the background, while Withings requires manual ECG recordings. Apple Watch has more published clinical validation data, but both ECGs meet the same FDA clearance standards.
Can Withings ScanWatch replace a medical pulse oximeter?
Withings ScanWatch SpO2 is validated to medical pulse oximetry standards (ISO 80601-2-61), making it the most clinically validated SpO2 wearable available. However, it should supplement rather than replace dedicated medical pulse oximeters, particularly in clinical settings where continuous monitoring and alarms are required.