Corpus Smart Scale review
by Corpus
As a scale it is excellent — consistent to within a few ounces and effortless to sync. The body fat, muscle mass and 'metabolic age' readings that justify the price are not measuring what the app implies they are.
Last updated · used for 14 weeks · reviewed by Tom
Disclosure: We have an affiliate relationship with Corpus. If you buy through a link on this page we may be paid a commission, at no additional cost to you. We bought and used this product ourselves, and Corpus had no involvement in this review, no advance copy, and no ability to change the score. Full disclosure
Tom’s verdict
Buy this for the scale, not the science. Corpus has built a genuinely good weighing device with a well-designed trend view that discourages the daily-number anxiety most people bring to this. Then it layers on bioimpedance estimates presented to one decimal place, which is a precision the method cannot deliver — our same-session readings moved several percentage points depending on hydration. 'Metabolic age' is marketing, not medicine. Ignore that half of the app and it is a good $89 purchase.
What we liked and what we didn’t
Strengths
- Weight measurement is consistent and repeatable, which is the part that matters
- Syncs reliably without opening the app first
- Trend view smooths daily noise instead of alarming you about it
- No subscription gate on the core weight tracking
- Multi-user recognition worked correctly across four testers
Problems
- Body fat percentage varied by several points across same-session weigh-ins
- 'Metabolic age' is not a recognised clinical measure
- The app presents estimates with a precision the underlying method cannot support
- Default settings share data for 'product improvement' — opt-out is in the app, not the box
Best for
Anyone who wants a reliable weight trend without thinking about it.
Not for
Anyone who will take the body composition figures seriously.
What the evidence actually shows
Consumer bioimpedance analysis is known to carry wide error margins, with readings sensitive to hydration, recent food intake, exercise and skin temperature. It can be useful for tracking direction over time under consistent conditions. It is not a substitute for DEXA or any clinical measure, and 'metabolic age' has no standard definition at all.
What we measured
Against a calibrated reference, weight readings were consistent within a few ounces across repeated weigh-ins — genuinely good for a consumer scale.
Body fat percentage was a different story. Stepping on and off five times inside two minutes produced a spread of several percentage points, and readings shifted further after drinking water. The app displays a single figure to one decimal place with no error range.