InterFasting vs Atomic Fast
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
InterFasting
This app helps users succeed with intermittent fasting through scientific and systematic management. It offers AI-powered schedule and calorie recommendations, a simple timer, and comprehensive tracking of fasting hours, meals, workouts, and water intake. Users can visualize progress and receive detailed reports to build healthy habits.
- AI fasting schedule recommendations
- AI food calorie calculation
- Intermittent fasting timer
- Customizable fasting plans
- All-in-one health tracking
- Fasting analysis and reports
- Home screen widget
Read full descriptionHide full description
Ready to make intermittent fasting actually work? InterFasting is the smart fasting tracker and fasting timer that helps you stay consistent without extreme dieting. No more guessing, no complicated calorie counting — just smart tools that actually work. Why people choose InterFasting • AI Schedule Recommendations Get a personalized intermittent fasting plan based on your lifestyle — no more trial and error. • AI Calorie Counter & Food Scanner Just snap a photo of your meal. Instantly see calories and macros without manual logging. • The Easiest Fasting Timer Supports 16:8, 5:2, OMAD, and fully custom schedules. Smart alarms keep you on track. • 100% Free Customization + Ad-Free Experience Adjust your fasting windows freely and track everything in a clean, distraction-free interface. • All-in-One Health Tracker Monitor fasting hours, weight progress, meals, workouts, and water intake in one place. • Home Screen Widgets Check your fasting stage and countdown timer instantly from your home screen. • Hour-by-Hour Body Stages See what’s happening in your body during a fast (Ketosis, Autophagy, and more). • Visual Progress & Photo Diary Log meals and take progress photos to stay motivated by real results. Science-backed benefits of intermittent fasting Effective fat burning and weight loss Boosted autophagy and cellular repair Better blood sugar control Reduced inflammation Improved mental clarity and energy Perfect if you want to start intermittent fasting for the first time, stay consistent with a reliable tracker, or combine fasting with keto and healthy weight loss goals. Consistency is the key. InterFasting helps you build habits that last. Download now and start your transformation. *** Apple Health Integration *** Automatically syncs weight, steps, and workout data with the Apple Health app. ABOUT SUBSCRIPTIONS & PAYMENT • Payment will be charged to your Apple ID account at confirmation of purchase. • You can manage or cancel your subscription in your App Store Account Settings at any time. • Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period. Terms of Service: https://www.interfasting.app/service_en Privacy Policy: https://www.interfasting.app/privacy
Atomic Fast
This app combines intermittent fasting with AI-powered calorie and macro tracking. It analyzes your eating patterns, hydration, sleep, and activity to provide metabolic insights and a daily readiness score. Seamlessly integrates with Apple Health for a holistic view of your well-being.
- AI calorie and macro estimation from photos
- Intermittent fasting timer with metabolic phases
- Break-fast meal scoring and suggestions
- Connects meals and fasts for holistic insights
- Daily readiness score based on health signals
- Apple Health and Apple Watch integration
Read full descriptionHide full description
Track your fasts through real metabolic phases, then snap a photo of your meal to log calories and macros in seconds — and see exactly how the two connect. Most fasting apps track time; most calorie apps track food. Atomic Fast connects both. Atomic Fast combines intermittent fasting, AI calorie tracking, macro counting, Apple Health insights, and hydration tracking in one app — made for people who already fast and want more than just a basic timer or food diary. FASTING TIMER WITH METABOLIC PHASES Track your fasts with a real-time fasting timer and estimated metabolic phase guidance. Follow your progress through clear visual stages, from digestion and transition to glycogen depletion, fat burning, ketosis, deeper fasting, and autophagy. Choose popular fasting schedules like 16:8, 18:6, 20:4, OMAD, or create your own custom plan. Adjust your goals anytime, and get fasting milestone notifications without the pressure. AI CALORIE TRACKING IN SECONDS Take a photo of your plate. Atomic Fast typically identifies foods in under 5 seconds and estimates calories, macros, and nutrients — like a smart AI calorie counter and macro tracker that actually understands what you ate. You can also log meals by: - Describing what you ate with text or voice - Scanning nutrition labels - Scanning barcodes - Searching the USDA food database - Adding meals manually when needed No more typing one ingredient at a time. BREAK-FAST SCORE The first meal after a fast matters. Atomic Fast scores your break-fast meal from 0 to 100, with practical suggestions on protein, fiber, carbs, and balance for a smoother transition back into eating. MEALS AND FASTS THAT WORK TOGETHER Most fasting apps track time. Most calorie trackers and food diaries track food. Atomic Fast connects both. See how your last meal affects your next fast, how your fasting consistency affects your eating patterns, and how nutrition timing may connect with sleep, recovery, and daily energy. METABOLIC INSIGHTS Atomic Fast helps you spot patterns across fasting, meals, hydration, sleep, heart rate, HRV, activity, and more. Interactive charts and daily insights help you understand habits like calorie trends, macro balance, fasting consistency, and how nutrition timing may connect with sleep, recovery, and energy levels. Daily insight examples: - "Ending eating by 7 PM dropped your sleeping heart rate by 4 bpm last week" - "On high-recovery days you hit your fasting goal 30% more often" Insights are calculated on your device. Your patterns stay yours. DAILY READINESS SCORE Wake up to a readiness score from key health signals: sleep, HRV, resting heart rate, activity, exercise, and respiratory rate. A simple guide to whether today is a good day to push your fast, stay normal, or focus on recovery. APPLE HEALTH AND APPLE WATCH Atomic Fast syncs 24 Apple Health data types: sleep, heart rate, HRV, steps, workouts, weight, respiratory rate, and more. Meals write 11 nutrients plus water back to Apple Health, keeping your nutrition data connected across your favorite health apps. HYDRATION TRACKING One-tap water logging. Smart reminders that fit naturally around your fasting routine. BUILT FOR EVERYDAY USE - Three themes including a signature Deep Purple mode - Two timer styles: Atomic Ring and Classic Ring - Smart notifications for fasting milestones, hydration, meal reminders, and weekly recaps - Awards and streaks to celebrate progress without pressure - Offline-first experience - Privacy-focused design - Apple Watch companion app ATOMIC+ The free version is the real product — fasting tracking, manual food logging, readiness score, daily insights, themes, and 7 AI meal scans per week, all free and ad-free. Atomic+ unlocks: - Unlimited AI meal scans - iCloud backup and data export Available as Atomic+ Monthly, Atomic+ Annual (with 7-day free trial), or Atomic+ Lifetime. Terms of Use: https://atomicfast.com/terms Privacy Policy: https://atomicfast.com/privacy
Screenshots
Verdict
The clearest difference is ads: Atomic Fast at none against InterFasting's shown. Atomic Fast also leads on rating (5.0 vs 4.8). InterFasting's advantage is ratings volume (352 vs 29) and iOS requirement (15.0 vs 18.0). On price, review sentiment, update cadence and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. InterFasting sells 5 in-app purchases, starting at $3.99 per month and Atomic Fast sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
Atomic Fast holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: InterFasting has 352 ratings behind it against 29, so its average is the more settled of the two. Written reviews point the same way: 89% of InterFasting's written reviews are positive against 96% of Atomic Fast's.
Both ship on a similar rhythm, roughly every 4 days. The most recent releases landed on October 25, 2026 and October 21, 2026 respectively.
| Parameter | InterFasting | Atomic Fast |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (352 ratings) | 5.0 (29 ratings) — better |
| Positive reviews | 88.6% of reviews | 96.3% of reviews — better |
| Number of ratings | 352 — better | 29 |
| Update frequency | Every 4 days | Every 4 days |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, Apple Watch |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 99 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Liviet | Startise |
Customer experience
InterFasting
Atomic Fast
In-app purchases
InterFasting
- Intermittent Fasting Monthly$3.991 Month
- Intermittent Fasting Monthly$6.991 Month
- Intermittent Fasting Annual$12.991 Year
Show 1 moreShow fewer
- Intermittent Fasting Annual$34.991 Year
- Premium User$12.99
Atomic Fast
- Atomic+ Monthly$4.991 Month
- Atomic+ Annual7 Days trial$29.991 Year
- Atomic+ Lifetime$59.99









