The best AI body scan apps, honestly

“AI body scan” covers two unrelated things. One is measurement: turning a photo or a phone-sensor scan into circumferences and a body-fat estimate. The other is assessment: turning that into a judgement about what to do next. Most of the category does the first and stops, which is why people end up with a folder of numbers and no plan.

What a phone camera can and cannot measure

Start here, because it decides which product category you actually need. A photo carries silhouette, proportion and surface detail. From those, software can estimate circumferences and, from circumferences, body fat — the same chain of reasoning a tape measure and a Navy-method equation use, which you can run yourself on our body fat calculator.

What a photo cannot do is see inside you. It cannot distinguish visceral from subcutaneous fat, it cannot measure bone density, and it has no access to hydration status. Any app claiming clinical-grade composition from a single image is overselling, ours included. The honest pitch for photo scanning is consistency: shot the same way each week, the same estimator surfaces change that a mirror and a scale both hide, even if its absolute number is off by a few points. We wrote that argument out in full in what is a physique score, and the setup that makes week-to-week photos actually comparable is in the progress photos guide.

Consumer apps that scan your body from a photo

Dietly — a score and the week that follows from it

Ours. One weekly photo becomes a Form Score out of 100 with a body-fat estimate, and — the part that distinguishes it — one named weak point. The week of training is then built around that weak point, your goal and the equipment you have, and next week’s scan is how you find out whether it worked. Food logging is included and exists to keep the plan fed. Free to start; Pro pricing is on the store listings. iOS 17 or later, and Android.

What it is not: a measurement tool. If you want your chest in centimetres, this is the wrong product and the next one is better.

Bodygram — measurements, in volume

Bodygram is an AI body-measurement platform. From a smartphone scan it produces 35 body measurements, a body-composition estimate covering body fat and muscle mass, and posture analysis. It sells both to businesses — retailers, insurers, fitness brands — and through consumer apps including Wellness by Bodygram and Body2Fit.

It is the more serious instrument of the two. It publishes no consumer subscription price on its site, and its commercial centre of gravity is enterprise licensing to retailers, insurers and fitness brands, which is also why its accuracy has been held to standards a consumer app never faces. What it does not do is tell you what to train on Tuesday. Full comparison →

LeanScreen — the professional’s version

Worth knowing about because it is the oldest serious entry in photo-based composition, and because it is explicitly not a consumer app. LeanScreen, part of PostureScreen, estimates body fat, waist-to-hip ratio, BMI, BMR and lean mass from “advanced 2D photographic anthropometry” — it measures anatomical regions in a photo and mathematically estimates the circumferences, with no calipers or tape. Its own site aims it at “fitness professionals, gym operators, nutritionists, dietitians, chiropractors, and physical therapists,” it is iOS only, and it publishes no price. If you are assessing clients rather than yourself, start there rather than with anything in the consumer tier.

The one that shut down, and why it should affect your choice

Amazon Halo was the best-funded photo body-scan product ever shipped: a phone-camera body-fat measurement backed by Amazon’s own published research. Amazon discontinued it effective 31 July 2023, refunded the previous twelve months of hardware and unused subscription fees, and from 1 August 2023 the devices and the app stopped functioning.

The lesson is not that the technology was bad. It is that this category has real churn, and a body-composition history is only valuable if it is long. Before you commit years of weekly scans to anything here — ours included — check that you can export your own data and that the photos stay yours.

Often listed as body scan apps. They are not.

Roundups in this category routinely pad themselves with nutrition and training apps, because those have the search volume. They are good products solving a different problem, and it is worth being clear which is which:

• Fitbod — The best-known AI workout generator. It plans from your logs; we plan from your body. Compared with Dietly →
• MacroFactor — The serious tracker's tracker. Its maths is better than ours; it cannot see you. Compared with Dietly →
• MyFitnessPal — The default food diary. Enormous database, no opinion about your training. Compared with Dietly →
• Cal AI — Photograph your dinner, or photograph yourself. Two different products. Compared with Dietly →

When the answer is not an app

A DEXA scan is the reference most consumer tools are validated against. It separates fat, lean mass and bone, and reports them regionally. It costs money per scan and requires a booking, which makes it the wrong instrument for weekly tracking and the right one for establishing a baseline once or twice a year. If you want to know how far off your app is, this is how you find out.

In-gym 3D scanners — the booths in the corner of some commercial gyms — rotate you and build a mesh, producing circumferences and a composition estimate. More consistent than a tape measure and tied to a place you have to visit.

Bioimpedance scales pass a small current through you and infer composition from resistance. They are cheap and they are on your bathroom floor, which makes them the most frequently sampled option — but the reading moves with hydration, so the daily number is noise and only the multi-week trend means anything.

A tape measure remains underrated. Waist circumference alone tracks most of what matters for health, costs nothing, and is the input to the Navy method that several of the apps above are, underneath, also using.

How to choose

Ask what you will do differently on the strength of the number. If the answer is “adjust my training,” you want something that produces an instruction, not a report — that is the gap Dietly was built for. If the answer is “track my measurements precisely,” a dedicated measurement product like Bodygram, or a tape measure and a spreadsheet, will serve you better and possibly for free. If the answer is “get my calories right,” you do not need a body scanner at all; you need a nutrition app. And if the answer is “find out my real body fat percentage,” book a DEXA scan once and stop shopping for apps.

Not medical advice. This article is general information written by the Dietly team. It is not written or reviewed by a physician or a registered dietitian. Body composition estimates from any consumer tool, ours included, are estimates and not clinical measurements. All product names and trademarks belong to their respective owners and their use here is for identification only; none of the companies named are affiliated with or endorse Dietly.