How does Lean calculate body fat?

Lean uses AI BodyScan technology: users take a photo of themselves and the BodyScan calculates the body fat percentage in about 5 seconds, then automatically recalculates the basal metabolic rate.

What are the four components of TDEE that Lean tracks?

TDEE consists of BMR (basal metabolic rate at rest), NEAT (energy from walking and non-exercise activity), EAT (energy from workouts), and TEF (energy spent digesting food).

How can I track meals with Lean?

Lean offers three ways to track calories: take a photo of your meal and the AI recognizes foods and portions, scan the barcode of packaged foods, or search the built-in food database containing USDA and OpenFoodFacts data.

How often does Lean recalculate my metabolism?

Lean constantly recalculates your metabolism from your physiological data to keep daily expenditure tracking as accurate as possible, and recalculates your BMR whenever you update your body fat percentage.

How can I get support if I have issues with the app?

You can contact the Lean team directly by submitting a message through their support form at lean-app.com/en/support/ or by emailing support@lean-app.com. The team reads messages directly and responds quickly.

Business profile · Fitness apps

Lean

Calorie counter that measures body fat from a photo and calculates real TDEE

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Lean at a glance

Lean

Category: Fitness apps
Based in: Vélizy-Villacoublay, France
Website: lean-app.com
Votes: 0

Lean metrics

Info on lean-app.com: Ahrefs Domain Rating and Majestic link info, each with the change since the last update.
Metric	Value
Domain Rating	10 no change since last check
Trust Flow	22 no change since last check
Citation Flow	31 no change since last check
Referring domains	574 no change since last check
External backlinks	605 no change since last check

Info: Ahrefs Domain Rating as of 17 Oct 2026, last changed 15 Oct 2026. Info: top topic is Business (22). Info: Majestic as of 15 Oct 2026, last changed 15 Oct 2026. Link info from Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.

Lean domain at a glance

Source: the public RDAP record, checked 16 Oct 2026, 14:18 UTC.
Domain age	1 year
Registered	14 Dec 2024
Expires	14 Dec 2026
Registrar	NameCheap, Inc.
DNSSEC	Not signed

Complete domain info for lean-app.com

Mobile app that tracks calories, body fat, metabolism and step count in real time to help users master their calorie deficit and reach body composition goals.

About

Homepage of Lean

Lean is a mobile application for iOS and Android that calculates total daily energy expenditure (TDEE) by tracking four components: basal metabolic rate (BMR) based on body fat measured from a photo using AI, non-exercise activity thermogenesis (NEAT) from step count, exercise activity thermogenesis (EAT) from workouts, and thermic effect of food (TEF) from dietary macros. The app includes an AI BodyScan feature to calculate body fat percentage from a single photo, AI meal recognition to log calories from photos, and metabolic adaptation tracking during calorie deficits.

Lean computes daily calorie expenditure live and adapts calorie targets throughout the day based on actual expenditure and eating patterns. The app integrates step counting, allows manual workout entry, includes a food database and barcode scanning, and provides a Progression Pyramid to guide users through fat loss.

Features at a glance

AI photo recognition of meals and portions
Body fat calculation from single photo using AI
BMR tracking with metabolic adaptation
Step count integration for NEAT calculation
Workout tracking with precise calorie expenditure
TEF tracking based on macro intake
Real-time daily expenditure calculation
Adaptive calorie targets throughout the day
Food database and barcode scanning
Progression Pyramid recommendations

Pricing

Pricing model: Freemium

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Quick answers

How does Lean calculate body fat?: Lean uses AI BodyScan technology: users take a photo of themselves and the BodyScan calculates the body fat percentage in about 5 seconds, then automatically recalculates the basal metabolic rate.
What are the four components of TDEE that Lean tracks?: TDEE consists of BMR (basal metabolic rate at rest), NEAT (energy from walking and non-exercise activity), EAT (energy from workouts), and TEF (energy spent digesting food).
How can I track meals with Lean?: Lean offers three ways to track calories: take a photo of your meal and the AI recognizes foods and portions, scan the barcode of packaged foods, or search the built-in food database containing USDA and OpenFoodFacts data.
How often does Lean recalculate my metabolism?: Lean constantly recalculates your metabolism from your physiological data to keep daily expenditure tracking as accurate as possible, and recalculates your BMR whenever you update your body fat percentage.
How can I get support if I have issues with the app?: You can contact the Lean team directly by submitting a message through their support form at lean-app.com/en/support/ or by emailing support@lean-app.com. The team reads messages directly and responds quickly.

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