Body Composition Devices Compared: Bioimpedance Analyzers and 3D Scanners
This page lists what each company says on its own public pages, checked on October 16, 2026. It is not a ranking or recommendation, and we have not tested or audited any product. Everything in the table is 'according to the company'; features and prices change often, so confirm on the company's site. These are non-radiation options (bioimpedance analyzers, scales and a 3D optical scanner); DEXA and other medical imaging are outside this site's scope. Published research finds bioimpedance and DXA are not interchangeable at the individual level, so treat any single reading as an estimate and track trends using the same device and conditions. Measurement accuracy varies by device, protocol and user. Results are general information, not medical advice or a diagnosis; medical decisions need a licensed clinician.
According to each company's own public pages, checked on October 16, 2026. Alphabetical, not a ranking. Prices appear only where the company publishes them. Confirm everything on the company's site.
| Company / product | Who it's for | What it measures | Form factor | Price (as published) | Evidence rating (of the topic) | Company pages |
|---|---|---|---|---|---|---|
| Evolt 360 | Gym, clinic or wellness business | The company says it provides 40+ health metrics in about 60 seconds, including body composition, plus calorie and macronutrient suggestions | Body composition analyzer that the company says uses a very low electrical current, with a companion app and business dashboard; the company says it is not recommended for people with pacemakers or certain implanted medical devices | Not published on the pages we reviewed; contact the company | 2/5 Limited Bioimpedance (BIA) body-composition analyzers | |
| InBody | Coach, clinic-gym or consumer (the company sells professional and at-home devices) | Muscle, fat and water measures; the company says its technology uses direct segmental multi-frequency bioimpedance (BIA) and does not use empirical estimates based on age, sex or ethnicity | Stand-on analyzers with hand electrodes (for example the portable, foldable 270S), plus cloud software and an app | Not published on the pages we reviewed; contact the company | 2/5 Limited Bioimpedance (BIA) body-composition analyzers | |
| Styku | Gym, clinic or wellness business; consumers via participating locations | 3D body scans with measurements, body composition estimates, posture and progress views, according to the company | 3D body scanner with analytics software and a client app, offered through plans | Plans shown from $199 per month (Access) on the company's pricing page; hardware purchase or lease options and add-on modules are listed there | Evidence rating: Not rated 3D optical body scanners for body-composition and circumference estimates | |
| Tanita body composition scales | Consumer or professional | Weight and body composition (at-home scales and professional-grade scales) | Body composition scales for the home and professional models for medical, academic and studio settings | Not published on the pages we reviewed | Evidence rating: Not rated Smart scales with bioimpedance body-composition estimates |
Not medical advice or a diagnosis. Measurement accuracy varies by device, protocol and user, and published validation studies cover only some products. Medical decisions need a licensed clinician. Evidence ratings describe research on the topic, not any company, and no company is scored. Looking for training equipment? See Training Equipment. Sponsored placement, if any, is labeled and does not change this information or any rating.
How to read the table
'Who it's for' reflects how the company describes its customers (consumers, coaches, gyms or clinics). 'Price' is shown only where the company publishes one; otherwise we say so and you would need to contact the company.
What the research says
A meta-analysis in athletes found bioimpedance overestimated fat-free mass compared with DXA, with wide limits of agreement, and a 2026 systematic review found bioimpedance estimates generally not equivalent to a four-compartment reference at the individual level. A recent study of 3D optical imaging found agreement depended on which DXA device served as the reference. We rate the bioimpedance category 2 of 5 and 3D optical scanning as Not rated; ratings describe the research on the topic, not any company.
Practical considerations
Hydration, food, exercise and time of day can change readings. Some manufacturers say bioimpedance devices are not recommended for people with pacemakers or certain implanted devices; check the manufacturer's instructions and ask a clinician if unsure.
FAQ
Is bioimpedance as accurate as DEXA?
Published reviews report that the two are not interchangeable at the individual level, though results vary by device and population. Use the same device and conditions to track trends.
Do these devices diagnose anything?
No. They provide estimates of body composition for fitness tracking, not diagnoses. Discuss health concerns with a licensed clinician.
Sources
- Dzator S et al. Agreement Between Dual-Energy X-ray Absorptiometry and Bioelectric Impedance Analysis for Assessing Body Composition in Athletes: A Systematic Review and Meta-Analysis. Clin J Sport Med 2023
- Oliver CJ et al. The Validity of Bioelectrical Impedance Analysis Compared to a Four-Compartment Model in Healthy Adults: A Systematic Review. J Funct Morphol Kinesiol 2026
- Ramirez S et al. Reference method matters: DXA system differences influence agreement with 3D optical imaging body composition estimates. Int J Obes (Lond) 2026
Links are provided for reference. Citing a study does not imply its authors endorse this site or any product.
Informational comparison, not a ranking or recommendation. Evidence ratings describe published research on each topic and are editorial opinions, not company grades. Descriptions are based on public information and not independently verified. Prices and features change; confirm on each provider's site. Some links may be affiliate links. Last reviewed October 16, 2026.
Longevity Ledger provides general information, not medical advice. Ratings are editorial opinions based on publicly available information. Consult a licensed clinician before changing medication, hormones, supplements, testing or training. Some links are affiliate or sponsored links; see our affiliate disclosure.