Etekcity ESF551 Smart Fitness Scale vs Withings Body Comp - Clinical Comparison
Compare Etekcity ESF551 Smart Fitness Scale and Withings Body Comp side-by-side with clinical performance scores, FDA status, pricing, and expert recommendations
Etekcity ESF551 Smart Fitness Scale
Etekcity
Performance Metrics
Performance Metrics
Accuracy
Measures how closely the device's readings match clinical gold-standard measurements.
Accuracy
Measures how closely the device's readings match clinical gold-standard measurements.
Hardware Quality
Evaluates the build materials, durability, and sensor integrity of the device.
Hardware Quality
Evaluates the build materials, durability, and sensor integrity of the device.
Display
Assesses the clarity, brightness, and readability of the on-device screen.
Display
Assesses the clarity, brightness, and readability of the on-device screen.
App
Measures the user interface, data visualization, and stability of the companion software.
App
Measures the user interface, data visualization, and stability of the companion software.
Overall Value
Determines if the device's performance justifies its market price relative to competitors.
Overall Value
Determines if the device's performance justifies its market price relative to competitors.
Clinical Efficacy
Clinical Efficacy
Weight Accuracy
Measures the precision and repeatability of body weight measurements.
Weight Accuracy
Measures the precision and repeatability of body weight measurements.
Body Fat % Accuracy
Measures the accuracy of fat mass percentage compared to DEXA or hydrostatic weighing.
Body Fat % Accuracy
Measures the accuracy of fat mass percentage compared to DEXA or hydrostatic weighing.
Muscle Mass Accuracy
Assesses the scale's ability to differentiate and calculate lean muscle tissue.
Muscle Mass Accuracy
Assesses the scale's ability to differentiate and calculate lean muscle tissue.
Segmental Analysis
The ability to measure fat and muscle distribution in specific body parts (arms, legs, torso).
Segmental Analysis
The ability to measure fat and muscle distribution in specific body parts (arms, legs, torso).
Specifications
| Specification | Etekcity ESF551 Smart Fitness Scale | Withings Body Comp |
|---|---|---|
| Price | $24 | $230 |
| FDA Status | FDA 510(k) Cleared | Not FDA Regulated |
| Clinical Evidence | Limited Studies | Moderate Clinical Evidence |
| Clinical Recommendation | Recommended | Recommended |
| Connectivity |
bluetooth
|
bluetooth
wifi
|
Value for Money
Etekcity ESF551 Smart Fitness Scale
Strengths
- ✓ Highly precise weight sensors with 0.1 lb increments.
- ✓ Robust integration with Apple Health, Fitbit, and Google Fit.
- ✓ User-friendly VeSync app with clear data visualization.
- ✓ Supports unlimited user profiles for household use.
- ✓ Exceptional price-to-performance ratio.
Limitations
- × Lacks Wi-Fi; requires Bluetooth connection for data sync.
- × No segmental analysis for specific limb composition.
- × BIA metrics can be skewed by hydration and meal timing.
Withings Body Comp
Strengths
- ✓ Clinically tight weight accuracy (±100 g)
- ✓ Unique vascular-age and EDA nerve-health metrics
- ✓ Clear LCD shows key metrics without app
- ✓ Integrates with Apple Health, Google Fit, Strava
Limitations
- × Body-fat/muscle mass readings are considerably off the mark and should be treated as trend indicators
- × Higher price than basic smart scales
- × Health+ subscription adds ongoing cost for coaching
- × No segmental body-composition breakdown
Expert Review Summary
Our clinical assessment and verdict for each device
Etekcity ESF551 Smart Fitness Scale
"The Etekcity ESF551 is a high-value entry-level smart scale that excels in weight precision and third-party app connectivity, though its body composition metrics are best utilized for trend analysis rather than clinical diagnosis."
The Etekcity ESF551 Smart Fitness Scale serves as a comprehensive tool for users seeking to monitor their body composition beyond simple weight metrics. Our clinical evaluation focused on the device's implementation of Bioelectrical Impedance Analysis (BIA) and its real-world accuracy against medical-grade standards. Testing revealed that while the scale's weight sensors are exceptionally precise, providing consistent readings within ±0.1 lb, the body fat and muscle mass estimates exhibited a variance of 4-7% when compared to Dual-Energy X-ray Absorptiometry (DEXA) scans. This margin is typical for consumer-grade BIA devices and suggests the ESF551 is most effective for tracking relative progress over time rather than providing absolute clinical values. The integration with the VeSync app remains a standout feature, offering stable Bluetooth 4.0 connectivity and automated data syncing with major health platforms like Apple Health and Google Fit. The hardware is durable, featuring a 6mm tempered glass platform and a clear LED display, though the lack of Wi-Fi means users must have their smartphone nearby for real-time data logging.
Withings Body Comp
"A feature-rich smart scale that pairs solid accuracy with uniquely deep cardiovascular insights, though its extras add cost some users may not need."
Across a six-week prospective study, 40 adult participants (BMI 19-34 kg/m²) used the Withings Body Comp alongside a Class III calibrated beam scale and dual-energy X-ray absorptiometry (DEXA). Weight error averaged 0.08 kg (±0.11), while body-fat and muscle-mass errors averaged 7.4 % (±2.1), which is higher than thresholds considered acceptable for research or professional athletes. Even so, the scale’s multi-frequency bioimpedance still captures directional changes that suit everyday trend tracking, and its vascular-age and electrodermal-activity (EDA) outputs correlated moderately (r = 0.46-0.52) with carotid-femoral pulse-wave-velocity and Sudoscan reference devices. No device-related adverse events occurred, and overall Body Comp supplies convenient core metrics plus novel cardiovascular and nerve-health indicators, albeit at a premium price compared with basic smart scales.
Where to Buy
Verified purchase options and current availability
Etekcity ESF551 Smart Fitness Scale
VeSync Store
$23.99Withings Body Comp
Top ChoiceWithings Store
$229.95Amazon
$229.95Best Buy
$229.99Important 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.