Comparison

Atomic Fast vs Agesync

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read 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

About

Agesync

Features
Read full description

Know what’s actually happening inside your body. Most people have never seen a full picture of their own biology. They get a blood test, hear “everything looks fine,” and go home with no plan. Agesync exists to change that. Agesync is a physician-led longevity and hormone health platform. The app connects lab-grade blood testing, licensed physicians, and personalized treatment plans — so you’re not guessing about your health, you’re measuring it. HOW IT WORKS 1. Order a blood test — at-home collection 2. A licensed physician reviews your results — every single one 3. Get your personalized plan — built on your actual biology 4. Track your progress — repeat testing shows what’s changing and why WHAT YOU CAN DO IN THE APP •⁠ ⁠Track your biomarkers across testing cycles — hormones, metabolic markers, and more •⁠ ⁠See your results explained in plain language, not lab jargon •⁠ ⁠Follow your personalized treatment plan and protocols •⁠ ⁠Book appointments and telehealth consultations with physicians •⁠ ⁠Get reminders for testing, follow-ups, and your plan — only when they matter •⁠ ⁠Message your care team directly WHY AGESYNC IS DIFFERENT •⁠ ⁠Physician-led, always. Every result is reviewed by a licensed doctor. No algorithm ever makes a clinical decision about your care. •⁠ ⁠Real laboratory testing. Full blood panels analyzed in certified labs — not finger-prick estimates. •⁠ ⁠Longitudinal tracking. Your data builds over time, so you can see trends, not just snapshots. •⁠ ⁠One record, everywhere. Your history travels with you across clinics and consultations. WHO IT’S FOR Agesync is for people who want to understand their body before problems show up — whether that’s energy, sleep, weight, hormone balance, or long-term health. If you’ve ever been told “your results are normal” but didn’t feel normal, this is for you. YOUR DATA, PROTECTED Your health data is encrypted in transit and at rest, handled under GDPR-compliant practices, and never sold. Access is limited to you and your care team. Agesync operates across EU markets and the United States through a network of partner clinics and certified laboratories. Download Agesync and find out what your body’s been trying to tell you. SUBSCRIPTION TERMS Agesync offers monthly and annual auto-renewing subscriptions. Payment is charged to your Apple ID at purchase confirmation. Subscriptions renew automatically unless cancelled at least 24 hours before the renewal date. Manage or cancel anytime in your Apple ID account settings. Privacy Policy: https://agesync.com/privacy Terms of Use: https://agesync.com/terms-and-conditions/

Screenshots

Atomic Fast4 screens
Agesync4 screens

Verdict

The call

The clearest difference is update cadence: Atomic Fast at every 4 days against Agesync's every 2 weeks. Agesync's advantage is iOS requirement (15.5 vs 18.0). On price, ads, in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Atomic Fast sells 3 in-app purchases, starting at $4.99 per month and Agesync sells 3 in-app purchases, starting at $59.00 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Atomic Fast ships an update every 4 days, Agesync every 2 weeks. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 8 level
Atomic Fast versus Agesync: the parameters behind the verdict, then further details
ParameterAtomic FastAgesync
PriceFreeFree
Rating5.0 (29 ratings) — better—
Positive reviews96.3% of reviews—
Number of ratings29 — better—
Update frequencyEvery 4 days — betterEvery 2 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS18.015.5 — better
Further details — not scored
Size22 MB171 MB
Age rating4+17+
DeveloperStartiseAgesync d.o.o

In-app purchases

3 purchases

Atomic Fast

Subscriptions2
  • Atomic+ Monthly$4.991 Month
  • Atomic+ Annual7 Days trial$29.991 Year
One-time1
  • Atomic+ Lifetime$59.99
3 purchases

Agesync

Subscriptions3
  • Basic$59.001 Month
  • Premium$119.001 Month
  • Elite$179.001 Month

Questions

Is Atomic Fast free?
Atomic Fast is free to download, with in-app purchases available.
Is Agesync free?
Agesync is free to download, with in-app purchases available.
Do Atomic Fast or Agesync have ads?
Neither Atomic Fast nor Agesync shows ads.
Which is updated more often, Atomic Fast or Agesync?
Atomic Fast ships an update every 4 days, and Agesync every 2 weeks. Most recently, Atomic Fast was updated on October 21, 2026 and Agesync on October 24, 2026.

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