Shifting Source

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.