Leptin

Fasting, meals and movement

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Leptin brings when you eat, what you eat and how you move into one plan for the day, and adjusts it when life gets in the way. It is not a calorie counter. There are no targets to miss and no warnings attached to a meal, because the point is the pattern over weeks, not a number at dinner. And it is not only for people managing a diagnosis. This is simply how eating and movement work, for everyone. Together these shape your metabolic health, which is the thing underneath weight, energy and how you feel through the day. FAST - a timer built around metabolic phases rather than a plain countdown, with a Live Activity so your progress stays on the lock screen. EAT - break-fast and meal guidance, meal logging with photos, and a nutrition database, so progress isn't undone in the first bite. MOVE - guided workouts with an audible coach that calls out each phase and keeps going while your phone is locked, interval walking sessions, freestyle logging, and movement suggestions tuned to how long you have been fasting. COACH - an AI coach that adapts to your fasting state, goals, and history. INSIGHTS - streaks, history, and progress over time, plus Apple Health sync so your workouts and activity stay in step with the rest of your health data. Leptin works offline: sessions and logs are captured on the device and sync when you are back online. Leptin is a wellness and lifestyle app. It is not a medical device and does not diagnose, treat, cure, or prevent any disease, and it does not provide medical advice. The in-app AI coach is an assistant, not a clinician, and its guidance should never be relied on for medical decisions. Consult a qualified healthcare professional before starting any fasting, nutrition, or exercise program, especially if you are pregnant or breastfeeding, under 18, or living with a medical condition such as diabetes, heart disease, low blood pressure, or a history of disordered eating. Stop and seek medical attention if you feel faint, disoriented, unusually short of breath, experience chest pain, or feel unwell in any way. Core fasting tracking, timers, and insights are free. SUBSCRIPTIONS Leptin offers optional auto-renewable subscriptions (subscription group "Leptin Plans") that unlock the AI coach with a monthly credit allowance plus expanded access to guided programs: - Basic: $9.99/month or $99.99/year - Premium: $19.99/month or $199.99/year - Unlimited: $49.99/month or $499.99/year Payment is charged to your Apple ID at confirmation of purchase. Your subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours prior to the end of the current period. You can manage or turn off auto-renew in your App Store account settings after purchase. Terms of Use (EULA): https://leptin.app/terms Privacy Policy: https://leptin.app/privacy

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The meal card now leads with what you actually ate rather than a counter, and once you have logged a meal it opens on the page that lets you log the next one — Scan a menu, Check a meal and Log meal are where you left them. Home has a bar across the top: Fast, Eat, Move, Coach, Insights. It follows along as you scroll so you can see which part of your day you are looking at, and tapping one shows just that part of Home. Tap it again to bring everything back. New at the top of Home: Now — the one thing worth doing next, with a button to get on with it. Opening the app is a great deal faster, and Home arrives in one piece instead of assembling itself in front of you.

The developer, GRAYLIN AI (PTY) LTD, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Linked to You

    The following data may be collected and linked to your identity:

    • Health & Fitness
    • Purchases
    • Contact Info
    • User Content

Privacy practices may vary, for example, based on the features you use or your age. Learn More

The developer has not yet indicated which accessibility features this app supports. Learn More

Seller
  • GRAYLIN AI (PTY) LTD
Size
  • 58.5 MB
Category
  • Health & Fitness
Compatibility
Requires iOS 15.1 or later.
  • iPhone
    Requires iOS 15.1 or later.
  • iPod touch
    Requires iOS 15.1 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
  • English
Age Rating
9+
In-App Purchases
Yes
  • Unlimited Yearly $499.99
  • Premium Yearly $199.99
  • Basic Yearly $99.99
  • Unlimited Monthly $49.99
  • Premium Monthly $19.99
  • Basic Monthly $9.99
  • $100 AI Credits $129.99
  • $50 AI Credits $64.99
  • $25 AI Credits $32.99
  • $10 AI Credits $12.99
Copyright
  • © 2026 Graylin AI (Pty) Ltd