Hydrostatic is designed for a facility-based body-composition assessment. FitCommit provides a photo-based estimate you can repeat at home and connects it to your targets, After Photo, and food log. Choose based on the setting and detail you need.
Photo-based estimate accuracy
Very good accuracy
Uses photo-based AI to analyze three photos (front, side, back) and estimate body fat percentage, lean mass, and measurements for trend tracking.
Also called underwater weighing. You sit on a scale submerged in a pool of water, exhale completely, and hold still while your underwater weight is recorded. The difference between your land weight and underwater weight determines body density, which calculates body fat percentage.
| Category | FitCommit | Hydrostatic | Winner |
|---|---|---|---|
| Accuracy | Photo-based estimate (No published FitCommit-specific margin) | Very good (+/- 2-3%) | Hydrostatic |
| Cost | Unlimited scans included | $50-100 | FitCommit |
| Convenience | Phone camera, anywhere | Universities and specialized labs | FitCommit |
| Time Per Test | Take three photos and get your estimate | 15-30 minutes | Tie |
| Tracking Frequency | Weekly or more | Quarterly | FitCommit |
Accuracy ranges on this page are directional estimates from body-composition research. These methods do not measure the same physical signal, so the cleanest comparison is trend consistency, cost, access, and whether you need a clinical-grade baseline. Use one method under consistent conditions, and use clinical testing when a medical or research-grade answer matters.
FitCommit connects a photo-based body-composition estimate, food tracking, and an After Photo preview in one system. Each tool uses the same plan and progress inputs.
Try it free →Try all these methods in one app
AI body scan, food tracking, and transformation preview. One system.
DEXA is the better choice when you need a clinical baseline. FitCommit is built for convenient at-home trend tracking. FitCommit has not published a DEXA validation study, so do not treat its estimate as a clinical measurement.
No. FitCommit provides an AI estimate for progress tracking. It is not a clinical measurement, diagnosis, or replacement for a DEXA scan when clinical precision matters.
Scan once a week at roughly the same time of day, in similar lighting and clothing. Body composition moves slowly, so follow the trend across several weeks instead of reacting to one result.
Lighting, clothing, posture, hydration, and normal day-to-day variation can move an estimate. Scan under similar conditions and follow the trend across several weeks.
Deficit levels with timelines and calorie targets for fat loss
Build muscle and lose fat at the same time
Visual reference for every body fat percentage for men and women
Plan meal timing around training, eating windows, and macro targets
How many calories you need per day by age, gender, and activity
Realistic timelines for any weight loss goal
Take three photos to estimate body fat and lean mass, then connect the result to your targets and weekly trend.
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