Shifting Source

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.