Protokl
Diet & Weight Training Engine
Science-backed fitness app that builds personalized workout and nutrition plans around your body composition, goals, and experience level. Syncs with Apple Health and forecasts your actual fitness trend using published physiological research.
How Protokl Works
From your first weigh-in to hitting your goal weight — here's the loop.
Enter your stats
Weight, height, body fat %, goal, and activity level. Takes 60 seconds.
Get your personalized protocol
Protokl calculates your optimal macros, training plan, and body-composition forecast — calibrated to your exact physiology.
Log and adapt
Snap photos of meals, log workouts, and watch your forecast update in real time as the app learns your actual metabolism.
Everything in one app
No spreadsheets. No guesswork. No five different apps.
Body Composition Forecast
See your projected weight, body fat %, and lean mass 3–12 months out — updated dynamically as you log.
AI Meal Photo Logging
Take a photo of your plate. Protokl identifies every item and logs macros automatically — no barcode scanning required.
Adaptive Training Plans
Progressive overload built into every session. Your plan adjusts to your performance, recovery, and goal weight.
Apple Health Integration
Reads steps, sleep, HRV, VO₂ max, and 50+ health metrics. Everything in one place — nothing leaves your device.
Free Fitness Calculators
Science-backed tools — no signup, instant results.
Frequently Asked Questions
What is Protokl?
Protokl is a science-backed iOS fitness app that builds personalized workout and nutrition plans around your body composition, goals, and experience level. It syncs with Apple Health and uses proprietary forecasting algorithms to project your fitness trend.
How does Protokl use AI?
Protokl uses AI for meal photo analysis (take a photo of your plate to log macros automatically) and for building personalized training protocols based on your body composition data, training experience, and goals.
Is Protokl free?
Protokl has a free tier with core features. Premium features are available via an auto-renewable subscription through the App Store.
How does the body composition forecasting work?
Protokl uses a thermodynamic simulation based on published research — the Alan Aragon muscle gain model, Alpert fat oxidation limits, Forbes P-ratio for lean mass preservation, and adaptive TDEE modeling. It projects your weight, body fat %, and lean mass 3-12 months forward.
Does Protokl work with Apple Health?
Yes. Protokl integrates with Apple HealthKit to read and write 50+ health data types including steps, sleep, heart rate, HRV, VO2 max, body mass, and dietary intake. All HealthKit data stays on your device and is never shared with third parties.
Ready to stop guessing?
Download Protokl free on iOS. Your personalized protocol is waiting.
Download on iOS — Free