Shifting Source

Fasting, keto and training in one simple app. Snap a photo of your plate and get an estimate of your macros with Apple's AI. Follow your fast right on the Lock Screen, and build habits that last.

SCAN WITH APPLE'S AI
• Plate: take a photo and get an estimate of fat, protein and carbs. Adjust it and save it as a meal with one tap
• Menu: see which dishes may fit keto when you eat out
• Fridge: get inspiration for keto meals

FASTING TIMER ON YOUR LOCK SCREEN
• 16:8, 18:6, 20:4, OMAD or your own window
• Follow your fast on the Lock Screen, in the Dynamic Island and in the Smart Stack on Apple Watch
• The timer walks you through every fasting phase, hour by hour
• Longer fasts (48 to 72 hours) with a safety check before you start

KETO WITHOUT THE HASSLE
• Net carbs, fat and protein at a glance
• Personal calorie and macro targets, calculated for you
• Today's carbs against your goal

TRAINING AND HABITS
• Five exercises with clear steps and an easier version when you need it
• Log sets and reps in seconds
• Weekly challenges that grow with you
• Streaks and badges that keep you going
• Guided breathing for calm and focus

SEE THE WHOLE PICTURE
• Fasts, meals, training and wellbeing in one calendar
• Weight, resting heart rate, HRV and sleep from Apple Health
• Energy, mood and hunger over time

LEARN AS YOU GO
• Guides on fasting and keto in plain language
• Built on peer reviewed research

YOUR DATA IS YOURS
• No account and no ads
• Everything is stored on your iPhone, and health data is never shared with third parties
• Photos are never stored, and Apple Private Cloud Compute keeps nothing
• Export or delete everything with one tap

Plate and fridge require iOS 27 and an iPhone with Apple Intelligence.

Shifting Source does not provide medical advice. Talk to your doctor before you start fasting or eating keto, especially if you are pregnant, breastfeeding or have a medical condition.