Calorie tracking only works if the target is right. Most apps compute your metabolism with population formulas from 1919 (Harris-Benedict) or 1990 (Mifflin-St Jeor) that ignore the single variable that matters most: your body composition. Two people with the same weight can differ by hundreds of calories per day.

Lean fixes the foundation first. Take one front-facing photo and the AI BodyScan estimates your body fat percentage in 5 seconds. From there, a patented proprietary model computes your BMR on your real lean mass, not on a 100-year-old average.

Then Lean tracks the complete energy equation: TDEE = BMR + NEAT + EAT + TEF. Steps and daily movement (NEAT), workouts (EAT), and the thermic effect of food (TEF) computed from your actual macros. Lean is also the first consumer app to model metabolic adaptation, the slowdown that builds up during a long diet.

Logging stays fast: snap a photo of your plate (AI scan), scan a barcode, or search a 3M+ food database. A live calorie balance adapts your target through the day, and a Progression Pyramid keeps priorities straight.

10,000+ users. 4.7/5 on the App Store, 4.5/5 on Google Play. Available in 8 languages on iOS and Android. Premium subscription with a 7-day free trial on the annual plan.