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Choose the Garmin Index S2 if you already use Garmin Connect and mainly want weight trends plus standard body-composition estimates. Choose the Withings Body Scan if its wider health-measurement range is more useful to you. Neither is an established accuracy winner: the available evidence does not include an independent, directly comparable test of these two scales.
At a glance: how the scales differ
| What matters | Withings Body Scan | Garmin Index S2 |
|---|---|---|
| Best fit | People who want Withings’ broader health-measurement proposition. | People who use Garmin Connect and want connected weight tracking with familiar body-composition estimates. |
| Measurements and features established in the cited sources | Withings describes body composition and additional cardiovascular indicators for the original Body Scan. See its scale comparison. | Weight, body-fat percentage, BMI, skeletal muscle mass, bone mass and body-water percentage; Wi-Fi sync to Garmin Connect, support for up to 16 users and a 30-day on-device weight trend, according to Garmin’s launch announcement. |
| Accuracy evidence | Withings reports correlations with DEXA from a study involving 80 people; the figures are not an independent head-to-head result. | Garmin documents its bioelectrical impedance method and factors that can affect readings; the cited Garmin sources do not provide a directly comparable DEXA study. |
| Price context | No current price for the original Body Scan is established here. BodyScan 2 is a separate generation. | Garmin listed a $149.99 suggested retail price at the Index S2’s 2020 launch; this is not a current price. |
Which scale should you choose?
Choose Garmin Index S2 for Garmin Connect and household trends
The Index S2 automatically syncs readings over Wi-Fi to Garmin Connect after setup. Garmin’s launch announcement specifies support for up to 16 users and a 30-day weight trend displayed on the scale. If your health and fitness records already live in Garmin Connect, that integration is the clearest reason to prefer the Garmin Index S2 smart scale.
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Its documented measurements cover the basics many buyers want to follow: weight, body-fat percentage, BMI, skeletal muscle mass, bone mass and body-water percentage. Garmin says battery life is up to nine months, but that is a manufacturer-stated maximum, not a guarantee for every household or usage pattern.
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Withings presents the original Body Scan as measuring body composition alongside additional cardiovascular indicators. That broader set may suit someone who wants more than weight and standard composition estimates, provided those measurements and the Withings app fit their needs. Review the Withings scale comparison and verify the exact model generation before buying the Withings Body Scan smart scale.
#1 Best Overall
- THE ULTIMATE BODY ANALYZER - Body Scan is our most precise smart scale, for faster fitness improvement.
- INCREASE MUSCLE MASS FASTER - Precisely locating areas of muscle imbalance or excess fat may help to increase muscle mass faster.
- ACHIEVE FITNESS GOALS FASTER - Follow consistent and precise weight measurements (50 g / 0.1 lb), and track your weight trend on the scale’s high-visibility color screen or in the app.
- MONITOR CARDIOVASCULAR HEALTH - Estimates the age of your arteries to give a clearer picture of your heart health by understanding how well your heart and blood vessels are functioning.
- FOLLOW YOUR HEART - Evaluate your heart rate at every weigh-in, a good indicator of overall cardiovascular fitness.
What the accuracy evidence does—and does not—show
Withings says Mon Stade, a French health and sports center, collaborated on a comparison involving 80 people. Its account describes one DEXA control scan and three consecutive Body Scan measurements for each participant. Withings reports correlations of r = 0.99 for total fat mass, r = 0.98 for lean mass, r = 0.98 for total muscle mass and r = 0.95 for total water mass. The company’s DEXA comparison explanation does not state a publication date.
These are correlations reported by Withings, not independent findings. Correlation indicates that measurements tend to vary together; by itself, it does not show that every person’s scale reading closely agrees with a DEXA result. Nor does it establish that Body Scan is more accurate than Index S2: the cited evidence does not test both models against the same reference under the same protocol.
Rank #2
- A CLINICAL SCAN OF YOUR HEALTH - Body Smart, developed in collaboration with leading hospitals and clinical institutions, has been clinically validated.
- ACHIEVE YOUR WEIGHT GOALS FASTER - Reliably track your weight to within 50 g and view your weight trends directly on the scale's high-resolution color display.
- INCREASE MUSCLE MASS FASTER - Increase muscle mass faster by analyzing body composition to tailor efforts.
- FOLLOW YOUR HEART - Evaluate your heart rate at every weigh-in, a good indicator of overall cardiovascular fitness.
- BOOST YOUR METABOLISM - Boost your metabolism by estimating the energy your body needs every day.
Garmin’s Index S2 owner’s manual says the scale uses bioelectrical impedance (BIA): a small electrical current passes from one foot through the body to the other, and the scale uses that measurement to estimate body composition. Neither scale’s estimates should be treated as diagnostic measurements or a substitute for clinical assessment.
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Garmin warns that weight, hydration and water distribution can affect body-composition results. For comparisons over time, keep measurement conditions as similar as practical and follow the manual’s guidance:
Rank #3
- A CLINICAL SCAN OF YOUR HEALTH - Body Scan, developed in collaboration with leading hospitals and clinical institutions, has been clinically validated.
- INCREASE YOUR MUSCLE MASS FASTER - Use the scale handle to precisely locate muscle imbalances and excess fat in the arms, legs, and torso.
- DETECT A CARDIAC ANOMALY - Use the electrocardiogram to identify any signs of atrial fibrillation, the most common form of cardiac arrhythmia.
- EVALUATE THE NATURAL PROTECTIVE FUCTION OF THE SKIN - Assess sweat gland activity in the feet to evaluate the natural protective function of the skin, all within seconds.
- MONITOR YOUR CARDIOVASCULAR HEALTH - Every day analyze the condition of your arteries with our revolutionary assessment that measures arterial stiffness, a significant contributor to hypertension.
- Weigh yourself at approximately the same time of day.
- Wait two hours after eating, drinking, exercising, bathing or using a sauna before taking a measurement.
These are Garmin’s recommendations for the Index S2, not a guarantee that readings will match a clinical test or that day-to-day variation will disappear.
Check the Withings model generation before comparing prices
Withings lists “Body Scan” and “BodyScan 2” as separate products. Its support FAQ says BodyScan 2 launched in the EU on June 9, 2026, and in the US on July 20, 2026. The FAQ lists prices of €499.95, £449.95 and $599.95 for BodyScan 2; those figures are not prices for the original Body Scan. See the BodyScan 2 FAQ and BodyScan 2 product page.
Rank #4
- FSA/HSA eligible
- See Your Progress Instantly: View segmental analysis, trends, and progress directly on the 4.3" TFT handle display of this smart scale—no phone needed after every scan. (Pair with the RENPHO Health App via Bluetooth before your first measurement.)
- Train Smarter with Deeper Insights: 8-electrode dual-frequency segmental BIA on this body fat scale reveals muscle and fat changes across different body areas, helping guide workouts, nutrition, and long-term health management.
- Turn Data into Action: Track 50+ body metrics, including segmental muscle and fat analysis, on this body composition scale to better understand training results, personalize nutrition plans, and support weight management and healthier habits.
- Guided for Every Measurement: Voice guidance walks you through every scan on the RENPHO MorphoScan Nova, ensuring consistent, accurate measurements for long-term health tracking.
Garmin’s $149.99 figure was the Index S2’s suggested retail price at its 2020 launch, not a current street price. For a fair buying comparison, check live listings in your country and confirm that each listing is for the exact scale generation you intend to purchase.
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For Garmin Connect users who prioritize household sharing and weight trends, the Index S2 is the more straightforward fit. For shoppers who value Withings’ broader health-measurement proposition, the original Body Scan is the more relevant option—if that generation is available and its specific features meet their needs. If accuracy alone will decide the purchase, the evidence presented here cannot establish a winner.
Quick Recap
Best Value
- A CLINICAL SCAN OF YOUR HEALTH - Body Comp, developed in collaboration with leading hospitals and clinical institutions, has been clinically validated.
- INCREASE YOUR MUSCLE MASS FASTER - Use the scale handle to precisely locate muscle imbalances and excess fat in the arms, legs, and torso.
- DETECT A CARDIAC ANOMALY - Use the electrocardiogram to identify any signs of atrial fibrillation, the most common form of cardiac arrhythmia.
- EVALUATE THE NATURAL PROTECTIVE FUCTION OF THE SKIN - Assess sweat gland activity in the feet to evaluate the natural protective function of the skin, all within seconds.
- MONITOR YOUR CARDIOVASCULAR HEALTH - Every day analyze the condition of your arteries with our revolutionary assessment that measures arterial stiffness, a significant contributor to hypertension.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
