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Last updated: February 13, 2026
Hydrostatic wins on accuracy. FitCommit wins on cost, convenience, and tracking frequency. For most people who want to track body fat regularly without spending $75-150 per visit, FitCommit is the practical choice. Use Hydrostatic for quarterly validation if you want clinical-grade precision.
Good accuracy
Very good accuracy
Uses computer vision AI to analyze three photos (front, side, back) and estimate body fat percentage, lean mass, and body composition. Results in under 60 seconds.
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 | Good (+/- 3-5%) | Very good (+/- 2-3%) | Hydrostatic |
| Cost | $3.99/mo (unlimited) | $50-100 | FitCommit |
| Convenience | Phone camera, anywhere | Universities and specialized labs | FitCommit |
| Time Per Test | 60 seconds | 15-30 minutes | FitCommit |
| Tracking Frequency | Weekly or more | Quarterly | FitCommit |
FitCommit integrates body scanning, food tracking, and transformation preview into one system. AI body scan measures your composition. AI food camera logs nutrition. After Photo shows your future body. All from your phone.
Try it free →Try all these methods in one app
AI body scan, food tracking, and transformation preview. One system.
FitCommit AI body scan has an error margin of +/- 3-5%, compared to DEXA at +/- 1-2%. For tracking trends over time, FitCommit is more practical because you can scan weekly for $3.99/month vs $75-150 per DEXA visit.
For general fitness tracking, yes. FitCommit provides body fat percentage, lean mass, TDEE, and macros from your phone camera. For medical diagnostics or research, clinical methods like DEXA remain the standard.
Every 2-4 weeks is ideal. More frequent than weekly adds noise without useful signal. With FitCommit, you can scan as often as you like since it costs $3.99/month for unlimited scans. Clinical methods are typically quarterly due to cost.
Hydration has minimal effect on AI visual analysis compared to BIA methods (InBody, smart scales) where it can shift results by 2-3%. For best results with FitCommit, scan at the same time of day in consistent lighting.
Deficit levels with timelines and calorie targets for fat loss
Surplus levels with timelines and calorie targets for muscle gain
Build muscle and lose fat at the same time
Visual reference for every body fat percentage for men and women
Fasting schedules and how they affect fat loss at different body fat levels
Timelines for losing 5 to 100 pounds at different deficit levels
AI body scan from your phone camera. Body fat percentage, lean mass, TDEE, and macros. No equipment. No gym. Free 1-month trial.
Try FitCommit Free