CoreFast is a calm intermittent fasting tracker that keeps your data on your phone. Pick a plan, tap Start, and see where your fast is at a glance.
No account. No ads. No surprise charges.
Ending a fast early is recorded neutrally, never as a failure.
Today and plans
• A live timer that stays accurate if you close the app or go offline
• Daily plans from 12:12 to 23:1, plus 5:2, alternate-day, Sunrise to sunset and a custom plan
• Each plan explains what a day on it looks like before you switch
• Water tracking with your own daily goal
• Optional local reminders, with quiet hours
• Optional streaks with a weekly rest day, and challenges you choose to join
• Longer fasts come with a short sheet on what to expect and when to stop
Food log (optional)
• Log what you eat during your eating window
• Scan packaged foods by barcode (you can turn this off in Settings)
• See calories that other apps log to Apple Health
Health readings (optional)
Connect Apple Health to see last night's sleep, steps, active calories, resting heart rate, HRV and glucose next to your fast. CoreFast only reads; it never writes to Apple Health. Vitals shows your readings over 7 days, 30 days or all time, compared only with your own usual range, and a summary you can share if you choose. Readings are shown as recorded, not as an assessment.
Insights and Learn
Trends, history and a month calendar show how your fasts have gone. Week on week compares you only with yourself. Learn has 18 short reads in plain language, each with a link to its source. New to fasting? For your first four weeks, Today shows one short tip a day.
Circles (optional)
Fast alongside a few friends. Share your status, send a cheer, or run a group challenge, like Sugar free or a water goal, with a shared leaderboard. Updates are encrypted and pass through a relay that keeps them for up to 24 hours. Your fasting history and health readings are never sent.
Widgets, Watch and Siri
• Home Screen, Lock Screen and StandBy widgets; fast details stay hidden while your iPhone is locked
• A Live Activity and Dynamic Island countdown
• An Apple Watch app with one-tap End and Undo
• Siri, Shortcuts, and Controls for Control Center, the Lock Screen and the Action button
Private by design
Your fasts, food log, water and health readings stay on your device, stored encrypted. They are never sent to us or to any server. If you turn on barcode scanning, only the barcode number is looked up, at Open Food Facts. No account, no ads, no third-party analytics or tracking. Your location is used only if you choose the Sunrise to sunset plan, and is kept on your phone. Export a backup or spreadsheet whenever you like, or delete everything from Settings.
A note on safety
CoreFast is a tracking tool for general wellness. It is not a medical device and does not give medical advice. Fasting isn't right for everyone: talk to your clinician before you start, especially if you are pregnant, take medicines for diabetes, or have a history of disordered eating. Stop and eat if you feel unwell. A few private questions at the start can switch CoreFast to simple time logging, a quieter app with no streaks or longer plans.
Questions or feedback: corefast.support@icloud.com
Simple, effective, and motivating for building healthier habits!
Sai Kiran Jammula
I’ve been using CoreFast, and it’s been really helpful in tracking my fasting routine and staying consistent with my fitness goals. The app supports different fasting schedules, including 16:8 and 12:12, making it easier to choose a routine that works best for you.The water intake tracking feature is another great addition that helps me stay hydrated throughout the day. I also appreciate the insights into circadian vitality and the various challenges, such as sugar-free days and walking after meals. Being able to invite friends to participate in these challenges makes the experience even more engaging and motivating.Overall, CoreFast is a useful app for anyone looking to build healthier habits and stay consistent with their wellness goals.
Thank you to everyone who tested CoreFast. Based on your feedback, this update is about reliability.
- **Nothing lost.** If your phone is briefly busy when CoreFast saves a change, it tries again, so a fast you end or a drink you log is still there next time.
- **Siri keeps your totals private.** "Log water in CoreFast" still works in one step, even on a locked iPhone, but now says only what it logged. "How's my fast" (which asks you to unlock) has your totals.
- **The right fast, every time.** Ending a fast from Hunger help ends the fast that was running when you tapped.
- **Smoother.** Today does less work while the timer runs, so it stays smooth with a long history.
Your fasting and health data stay on your phone.
Version 2.2.5
The developer, SATISH CHANDRA KOLLI, 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 Linked to You
The following data may be collected but it is not linked to your identity:
Location
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
SATISH CHANDRA KOLLI
Size
57.8 MB
Category
Health & Fitness
Compatibility
Requires iOS 16.4 or later.
iPhone Requires iOS 16.4 or later.
iPad Requires iPadOS 16.4 or later.
Mac Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.