**youFAST — Intermittent Fasting**
Meet Ember, your personal AI fasting companion. youFAST makes intermittent fasting simple, smart, and motivating — whether you're just starting out or chasing your longest streak.
**EMBER AI COACH**
Ask Ember anything about fasting, nutrition, or your progress and get personalized answers instantly. Powered by Claude AI, Ember knows your streak, protocol, and readiness score to give you smarter coaching. Free users get 3 questions per day — Pro users get unlimited access.
**FASTING TIMER**
Start your fast with one tap. Watch Ember's ring fill as you move through scientifically-backed fasting phases — from Fed State all the way to Deep Fasting. Tap the ring to flip between elapsed time and time remaining.
**TRACK EVERYTHING THAT MATTERS**
• Body — weight charts, measurements, Waist-to-Height ratio
• Fitness — steps, resting heart rate, VO2 max, workouts (Apple Health)
• Nutrition — search 600,000+ USDA foods, scan barcodes, log meals by type
• Sleep — nightly sleep quality from Apple Watch or Health app
• Hydration — daily water intake tracking
**SNAP & TRACK**
Snap a photo of your meal and Ember identifies what's on your plate using Claude AI vision — automatically filling in calories, protein, carbs, and fat. No typing required. Includes a confidence score and lets you add hidden toppings or sauces after the scan.
**youFAST SCORE**
Your personalized 0-100 daily readiness score. Six signals — sleep, fasting, hydration, steps, heart rate, and streak — combine into one number that tells you how locked in you really are.
**ACHIEVEMENTS & CELEBRATIONS**
Earn badges for fasting milestones, streaks, weight goals, and step counts. Full-screen celebrations fire the moment you earn them. Share your progress and get cheers from friends.
**APPLE WATCH**
Glanceable fasting ring, live timer, and phase label on your wrist. Start and stop fasts directly from your watch — syncs instantly to your iPhone. Add a watch face complication for an always-on view.
**WIDGETS**
Six Home Screen and Lock Screen widgets keep your fast visible without opening the app. Tap the widget button to start or stop a fast instantly.
**youFAST PRO**
Unlock Ember AI Coach (unlimited), Snap & Track meal photo analysis, nutrition tracking, premium themes, and advanced insights.
youFAST is free to download. Pro features available via subscription.
Terms of Use: https://youfast.jinxbrothers.com/terms
I have tried to stay consistent with my fasting times, however on certain days my fasting times adjusts. It was nice to have this app to keep track for me when I wasn’t fasting at the same time every day. I couldn’t remember on my own and it was nice to have something to refer too. The AI coach was a great touch when I had questions about how I was feeling. I was able to stretch my fast times and determine which amount of time was best for me and my age. Once I was able to get the fasting piece down, adding food information was a nice add on. It was nice to be able to track what I wanted and not include anything I didn’t care much about . (Such as water tracking ) I also liked how it synced up with my phone and showed me how my steps for the day was increasing or decreasing. Helped to keep me motivated and pushed me to finish strong. Ember was a nice touch and made me feel someone was helping me along the way. I did do a longer fast when I wasn’t feeling well and wasn’t sure I could accomplish it but the little encouragement messages kept me going. All in all, I was happy with the interaction and data ! It’s a reasonably priced app that is not collecting my data. Thanks team ! Kudos !
Great app & user friendly!
BreneeS07
I’ve really enjoyed this app and the features it provides! I like that it allows me to adjust the timer since I often forget to start my clock during my fasting period. I love the nutrition section that allows me to track my meals and add a snapshot that provides my calorie, protein, and carb intake. The app also provides healthy recipes which is helpful in changing up my meals. I also love that it tracks my hydration and sleep. YouFAST has lots of great features and overall has been a wonderful tool to use for my weight loss management and journey.
Wow!
Elmo__85
I don’t consider myself a very tech savvy person but I found this app to be very user friendly and operates very smoothly compared to other apps I have tried. It helps me stay focused and achieve my goals and I find it easy to go back and adjust for times and data if I get too busy and forget to, which is quite often. Fantastic app!!
Best Fasting App I have Used
Tincupgamer
The app is straight forward and easy to use. I love the fact that I can pick and choose what I would like to track. The AI Coach is great source of information when I have questions about my diet, or fasting. Keep it up the great work!
1.1.3 - Fix impossible calorie readings from the scanner
FIXED
- Barcode scanner sometimes recorded absurd calorie values (e.g. a
Juice Monster showed 118,000 kcal). Root cause: some entries in the
Open Food Facts database have typos - contributors occasionally
enter energy in calories instead of kilocalories, or drop a decimal
point, so the wrapper says 120 kcal but the database record says
118,000. The 1.1.2 fix taught the scanner to prefer per-serving
values but still trusted whatever number was in the field.
Now the scanner cross-checks calories against the reported protein,
carbs, and fat using the standard 4-9-4 rule (4 kcal per gram of
protein and carbs, 9 kcal per gram of fat). Values that are more
than 3x what the macros can account for are rejected, and the
scanner falls back to USDA data for that product.
Version 1.1.3
The developer, Charles Jenkins, 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
Charles Jenkins
Size
10.2 MB
Category
Health & Fitness
Compatibility
Requires iOS 16.6 or later.
iPhone Requires iOS 16.6 or later.
iPad Requires iPadOS 16.6 or later.
Mac Requires macOS 13.5 or later and a Mac with Apple M1 chip or later.