Become Lean,
Stay Lean
Lean – Calorie counter & energy expenditure calculator
Lean, the mobile app that tracks your calories in, calories burned, metabolism and step count in real time: master your deficit and reach your body composition goals.
01 · The principleThe only way to lose fat
Set up a calorie deficit
Burn more than you eat: everything else (fasting, keto, detox) is just a different way to get there. But you still need to know your true expenditure, day after day.
02 · The formulaLean is the only app that calculates your calorie expenditure perfectly
TDEE = BMR + NEAT + EAT + TEF
03 · BodyScan AICalculate your body fat from one photo ✨🤙🏼
Body fat is essential to calculating your metabolism. Your precise BMR depends on your lean mass, not just your weight: one photo is enough, BodyScan AI computes your body fat percentage and Lean recalculates your metabolism.
04 · TrackingYour calories from a single photo ✨
Snap a photo of your meal, the AI recognizes foods and portions. Food database (USDA + OpenFoodFacts) and barcode scan included: 3 ways to track, zero friction.
05 · The methodHow do you become Lean?
BodyScan
Body fat percentage is a key input for calculating your basal metabolic rate. Just take a photo of yourself and our BodyScan will compute your body fat.
Basal metabolic rate (BMR) tracking
Lean constantly recalculates your metabolism from your physiological data to keep your daily expenditure tracking as accurate as possible.
Everything about basal metabolic rate →
Step Tracking (NEAT)
Step tracking is crucial when setting up a calorie deficit. The energy you burn walking is the second biggest part of your daily expenditure.
Everything about NEAT →
Workout tracking (EAT)
Lean determines the calorie expenditure of your workouts precisely, building on your basal metabolic rate.
Everything about EAT →
Digestion energy tracking (TEF)
Lean determines TEF (the Thermic Effect of Food), the energy your body spends digesting what you eat. TEF is the third biggest part of your daily expenditure.
Everything about TEF →
Perfect tracking of your daily expenditure
Basal metabolic rate (BMR), non-exercise walking energy (NEAT), exercise energy (EAT) and the Thermic Effect of Food (TEF): Lean tracks these in real time to calculate your daily expenditure.
Everything about TDEE →
Calorie intake tracking
Lean lets you track your calorie intake in 3 ways: food database, barcode scan, or AI meal photo analysis.
Calorie balance tracking
Lean computes your daily expenditure (TDEE) live and helps you eat exactly the right number of calories based on it. That guarantees you hit your calorie deficit goal perfectly.
Progression Pyramid
Not sure what to change, stuck in your fat loss? Follow the Progression Pyramid recommendations to unlock your progress.
06 · FeaturesKey features
The latest scientific advances in your pocket. Lean is built on a set of powerful equations and algorithms that adapt precisely to your biology: body fat percentage, weight, step count, eating patterns, workouts.
Calories made simpler to track
Photo scan of your meal calories, powered by artificial intelligence.
Precise body fat calculation
Your body fat computed from a photo scan using artificial intelligence.
Precise metabolism calculation
Metabolism calculated from your body fat with Lean’s patented proprietary model, built on the latest scientific findings.
Metabolic adaptation
Lean is the first app to precisely calculate your metabolic adaptation during a deficit.
Step Count Integration
Lean counts your steps and factors them into how many calories you should eat.
Calories/expenditure adaptation
As the day goes on, your calorie target adapts to your expenditure and the way you eat, making sure you reach your goals.
07 · They use itJoin 10,000+ users
08 · Going furtherFree tools and guides
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