Am I gaining muscle or just weight?
Each check-in estimates body fat, FFMI, lean mass, and muscle-group scores from your photo history.
See the signal behind the selfie.AI body analysis + Coach
Progress photos that explain what changed
Take or import a gym selfie. GainFrame estimates body fat, physique score, FFMI, and muscle groups, then Coach explains the trend using your photos, weight, workouts, and nutrition data.
Body fat %Muscle breakdownsAsk Coach why
Ask why it changed
Sources visible
See the analysis and Coach in action.
Import progress photos, get AI body analysis, compare check-ins, then ask Coach what changed and why.
Product walkthrough
Coach
Ask Coach what changed and what to do next.
Coach reads your photos, body metrics, Health data, lifts, and nutrition logs, then turns the trend into a concrete explanation or training adjustment.
Compare photosOpen data sourcesGet lift advice
What GainFrame helps you answer.
Top moversChange
Upper chest development+24
Side delt roundness+18
Weekly scans found the trend
What should I change next?
Deep Dive reports explain what changed, which muscles moved, and how your macro targets should shift for a bulk, cut, or recomp.
Turn a weekly photo into a training decision.Precision body composition
Every check-in becomes a measurable report.
Snap one photo for a quick scan, or add multiple angles for a more precise body-fat estimate.
Deep dive reports
Before and after photos, body fat, FFMI, lean mass, and a plain-English summary of what changed.
Trends over time
Track body fat, weight, FFMI, and muscle momentum across every check-in.
Adaptive macros
Get calorie and macro targets that update from your actual body composition.
Future You
See your future physique.
Choose 3, 6, or 12 months and preview where your current trend could take your body.
Check-ins
A weekly loop that keeps the trend clean.
Use guided photos so each scan is comparable, then review your score and body-composition readout without losing context.
Throwbacks
See progress you would have missed.
Automatic throwbacks compare older photos with today so small weekly improvements turn into a visible transformation.
Weight trend
Connect the scale to what your photos show.
Track weight, milestones, and rate of change next to physique updates so a bulk, cut, or recomp has a clearer signal.
60 second workflow
Snap. Analyze. Ask Coach.
Use the same loop every week and GainFrame keeps the trend clean enough for Coach to explain.
01Take the photo
Front, side, and back poses with consistent framing.
02Get the report
Body fat, FFMI, lean mass, 12 muscle scores, and a clear summary.
03Ask Coach what changed
Coach explains data sources, photo comparisons, lift trends, and next moves.
FAQ
Common questions.
How accurate is GainFrame's AI body fat estimation?
In one head-to-head comparison against a clinical DEXA scan, GainFrame’s body fat estimate agreed within 0.4 percentage points — the DEXA measured 18.6% and GainFrame estimated 19%. That is one user’s documented test, not a peer-reviewed validation. Separately, a 2025 peer-reviewed study in npj Digital Medicine found AI photo-based body fat estimation in general achieved 0.98 Concordance Correlation Coefficient with DEXA across 1,273 adults — higher than smart scales at 0.91–0.92. The honest read: AI photo analysis under consistent conditions is the most accurate widely-available consumer method, with the trend across weekly check-ins doing the real work over time.
How does GainFrame compare to a DEXA scan?
DEXA scans cost $75–150 per visit and require an in-person appointment. GainFrame runs on your phone and is free at the base tier. In a documented head-to-head, the two methods agreed within 0.4 percentage points on body fat (DEXA: 18.6%, GainFrame: 19%) — one comparison, not a multi-person validation study. DEXA still wins for bone density and absolute visceral fat measurement. For the weekly body fat tracking most lifters actually do, GainFrame is a credible at-home alternative at $0 versus $100+ per scan.
Is GainFrame more accurate than smart scales?
AI photo-based body fat estimation scored 0.98 Concordance Correlation Coefficient with DEXA in a 2025 peer-reviewed study (npj Digital Medicine, 1,273 adults), while smart scales using bioelectrical impedance analysis (BIA) scored 0.91–0.92. Smart scales are also heavily affected by hydration — readings can swing 3–5% based on a glass of water. AI photo analysis of standardized progress photos does not have that vulnerability. GainFrame uses the AI photo approach.
What does Coach know about me?
Coach can use your check-ins, GainFrame Score, body metrics (body fat, FFMI, lean mass, 12 muscle group scores), Apple Health data (sleep, HRV, steps, exercise), workout history from Hevy, Strava cardio activity, nutrition logs, and selected photo comparisons when those sources are available. All context loads automatically — you do not paste any data into the chat.
Are my photos private?
Your photos are sent securely for AI analysis and are never stored outside your device by GainFrame. There is no cloud account required to use the app, and your conversation history with Coach is stored on-device only.
Can I import old gym selfies?
Yes. Smart Import classifies old photos by pose and builds your transformation timeline automatically, so a year of gym selfies on your camera roll becomes a continuous body composition history without manual sorting.
Take a photo. Ask Coach what changed.
Download free. Start with one progress photo, get your AI analysis, and chat with Coach when you want the story behind the numbers.
Download on App Store