Shifting Source

Fasting & keto in one place

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

Completely free. No account, no ads and no subscriptions. Fasting timer with Live Activity, keto tracking, workouts and science based guides. Shifting Source brings intermittent fasting and the ketogenic diet together in one app. Built as the companion to the book The Keto & Intermittent Fasting Lifestyle, it follows the same principle: understand why it works, and the results will follow. FASTING TIMER WITH LIVE ACTIVITY • Choose 16:8, 18:6, 20:4, OMAD or your own custom window • Follow your fast right on the Lock Screen and in the Dynamic Island • See which phase your body is in along the way, explained in plain language • Extended fasting (48 to 72 hours) with a mandatory safety check before you start KETO WITHOUT THE HASSLE • Log meals with net carbs, fat and protein • TDEE calculator that gives you personal calorie and macro targets • Daily overview of your carbs against your goal TRAINING AND HABITS • Five exercises with instructions and an easier version of each • Log your sets and reps in seconds, including past days • Weekly challenges that grow with you, streaks and badges • Guided breathing exercises for calm and focus INSIGHTS • Calendar with fasts, meals, workouts and wellbeing day by day • Weight, resting heart rate, HRV and sleep from Apple Health • Trends for energy, mood and hunger over time LEARN WHY • Guides and research articles in English, Danish and Swedish • Excerpts from the book, open to everyone • All content is built on peer reviewed research YOUR DATA IS YOURS • No account and no login • Everything is stored on your device • Health data is never shared with third parties • Export or delete everything with one tap Shifting Source does not provide medical advice. Talk to your doctor before starting fasting or a ketogenic diet, especially if you are pregnant, breastfeeding or have a medical condition.

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New in 1.1: • The fasting timer now shows Start, Left and End with weekday, matching the Lock Screen • The Live Activity shows "Fast completed" when you reach your goal, and the timer keeps running • The daily tip now appears right in the notification, and a tap opens it instantly • Notifications now open the right place in the app • Extended fasting (48 and 72 hours) is open to everyone, with a mandatory safety check before you start • Breathing sessions started from the timer screen are now saved correctly and have sound • Reading time removed from articles • Minor improvements and bug fixes

Version 1.1

The developer, Hejlsvig Consulting AB, 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 Not Collected

    The developer does not collect any data from this app.

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

    Accessibility

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

    Information

    Seller
    • Hejlsvig Consulting AB
    Size
    • 9.7 MB
    Category
    • Health & Fitness
    Compatibility
    Requires iOS 26.0 or later.
    • iPhone
      Requires iOS 26.0 or later.
    • Mac
      Requires macOS 26.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.0 or later.
    Languages
    English and 2 more
    • English, Danish, Swedish
    Age Rating
    13+
    • 13+
    • Learn More
    • Infrequent
      Medical Treatment information

      Contains
      Health or Wellness Topics
    Copyright
    • © 2026 Hejlsvig Consulting AB
  • Developer Website
  • Privacy Policy

    • More by Hejlsvig Consulting AB

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