MeThreeSixty vs GainFrame (2026): 3D Avatar or AI Photos?

MeThreeSixty is the most downloaded 3D body scan app for a reason: it's genuinely free to scan, it's built by a company that makes professional scanning hardware, and two quick poses produce a measured avatar with no tape measure.

So why compare it to anything? Because the avatar is also its ceiling. A smoothed 3D mesh tells you your waist is 34 inches. It cannot tell you that your shoulders got harder, your midsection got visibly leaner, or your arms finally have separation. Those are the changes most lifters are actually chasing — and they're the changes a different kind of app is built to catch.

What is MeThreeSixty and what does it do well?

MeThreeSixty comes from Size Stream, a 3D body-scanning company founded in 2012 whose hardware lives in retail and research settings. The app distills that into a phone flow: front pose, side pose, tight clothing, and a minute later you have a 3D avatar with 14+ estimated measurements — waist, hip, chest, thigh, and more.

Three things it does genuinely well:

• The price of entry is zero. Scanning is free, on both iOS and Android.
• Privacy is handled properly. Scans process and stay on your device.
• The measurements are the product. If you need circumference numbers — for fit, for a weight class, for a coach who asks for them — this is the cleanest free way to get them.

The honest caveats: recent versions cap free users at their five most recent scans, moving unlimited history and extra metrics to Premium (offered around $5/month). And the avatar is deliberately smoothed — shape without surface detail.

What does GainFrame do differently?

GainFrame skips the avatar entirely. You take (or import) a regular progress photo, and AI returns an estimated body fat %, BMI, FFMI, a 1–100 physique score, and individual ratings for 12 muscle groups — the things you'd ask a very honest training partner to assess.

A GainFrame check-in: physique score, body fat, and a four-part breakdown — from one regular photo.

Because the input is a real photo, the comparisons work on the thing you actually see. Pick any two check-ins and it aligns your body, overlays the stats, and quantifies what changed — including which muscle groups moved from "Developing" to "Strong."

The muscle map: before-and-after body coloring plus a radar chart across individual muscle groups.

It can also backfill: point it at your camera roll and on-device AI finds old check-in photos, classifies them by pose, and builds a backdated timeline. Photos are analyzed by AI but never stored on a server.

The honest caveats mirror MeThreeSixty's: it's iOS only, the free tier covers 25 photos, and its numbers are AI estimates from an image — trend tools, not clinical instruments.

MeThreeSixty vs GainFrame: feature comparison

Which should you use for your goal?

Choose MeThreeSixty if:

• You need actual circumference numbers — fit, weight class, a coach's spreadsheet.
• You're on Android.
• You want a free monthly measurement check and don't need deep history.

Choose GainFrame if:

• The change you care about is visible — leanness, definition, proportions.
• You want per-muscle feedback on what's improving and what's lagging.
• You have months of gym photos in your camera roll you'd like turned into a timeline.

Use both if: you want a measurement log and visual scoring. They barely overlap, both have free tiers, and a monthly scan plus weekly photo check-ins covers everything a DEXA appointment would tell you between visits.

Frequently asked questions

Is MeThreeSixty accurate?

MeThreeSixty is built by Size Stream, a professional body-scanning company, and its two-pose scan produces measurement estimates generally regarded as solid for a consumer app. Like every camera-based method, accuracy depends on tight clothing, consistent posture, and lighting. Treat the numbers as trend data rather than tailor-grade measurements.

Is MeThreeSixty really free?

The scan itself is free, but recent versions cap free users at their five most recent scans. Unlimited scan history, extra health metrics, and faster processing moved to Premium, which has been offered around $5/month. For occasional measurement checks the free tier is fine; for long-term tracking the cap matters.

Does MeThreeSixty show muscle definition?

No. The 3D avatar is a smoothed mesh of your body's shape — it captures circumferences and proportions but not muscle separation, vascularity, or leanness detail. If seeing definition change is the point, actual progress photos (or an app that scores them, like GainFrame) show what the avatar can't.

Which is better for tracking a body transformation, MeThreeSixty or GainFrame?

MeThreeSixty is better if you want measurement numbers — waist, hips, chest — tracked over time on iOS or Android. GainFrame is better if you want to see and score visible change: body fat estimates, a physique score, and 12 muscle-group ratings from your actual photos, with side-by-side comparisons. Many people's real goal is the second one.

Can I use MeThreeSixty and GainFrame together?

Yes, and they complement each other well because they don't overlap much. A monthly MeThreeSixty scan covers your circumference log, while GainFrame handles frequent photo check-ins, muscle scoring, and before-and-after comparisons. Both have free tiers, so the combination costs nothing to try.

Does GainFrame measure waist size like MeThreeSixty?

No. GainFrame doesn't estimate circumferences — it analyzes photos for body fat percentage, FFMI, a physique score, and per-muscle ratings. If you specifically need inch measurements for clothing fit or a competition class, MeThreeSixty or a tape measure is the right tool.