Comparison

Calog vs FastOn

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

Head to head
About

Calog

This app uses AI-powered food scanning and science-backed nutrition principles to help you log meals quickly, track calories and macros accurately, and build healthy habits. It offers personalized guidance and adapts to your goals for effective weight management or muscle gain.

Highlights
  • AI food scanning with photo logging
  • Barcode and label scanner
  • Natural language manual meal logging
  • Detailed calorie and macro breakdowns
  • Personalized macro plan and guidance
  • Weight trend visualization
  • Flexible timeline meal logging
Features
Read full description

Calog combines advanced AI food scanning with proven nutrition and behavioral science to help you log meals faster, track calories and macros accurately, and build healthier habits with confidence. Calog’s science-backed macro model adapts to your goals and provides personalized calorie and nutrition guidance — so you can stay on track without stress. INSTANT FOOD LOGGING WITH SCAN AI Log meals in seconds with Calog’s AI-powered camera. Just snap a photo and get instant calorie tracking, macro breakdowns, ingredient detection, and portion estimates. Perfect for users who want a fast, reliable food tracker without tedious manual entry. • Photo-based food log powered by Scan AI • Automatic calorie, macro, and micronutrient detection • Portion estimation for more accurate calorie counting • Works for mixed dishes, takeout, and home-cooked meals BARCODE & LABEL SCANNER FOR ACCURATE TRACKING Scan packaged foods instantly with Calog’s built-in barcode scanner. Get verified calorie and macro data that strengthens your nutrition tracking accuracy. • Global barcode coverage • Fast and trustworthy calorie counter data • Recognizes front labels for quick meal logging FASTEST MANUAL MEAL LOGGING Prefer typing? Calog’s Quick Type lets you log meals using natural language. It recognizes foods and portions instantly, making it one of the fastest manual meal tracker tools available today. • Natural-language food tracking • Smart suggestions based on your history • Instant macro and calorie calculation ADVANCED CALORIE & MACRO TRACKER Calog breaks down your full macro profile — protein, carbs, fats — with clear visuals and targets designed for your goals. Perfect for users who need a complete macro tracker and nutrient tracker in one. • Daily calorie and macro dashboard • Macro and micronutrient breakdowns • Supports all diet goals: weight loss, maintenance, or muscle gain TIMELINE-STYLE MEAL LOG Calog uses a flexible timeline instead of restricted breakfast/lunch/dinner slots, making it a more intuitive food tracker for real-life eating patterns. • Meal logging without rigid categories • Clear overview of your entire day • Works for intermittent fasting, grazing, or irregular schedules PERSONALIZED CALORIE AND MACRO PROGRAM Set your goals and Calog creates a tailored macro plan. Using your logged data, the app adapts to your habits and provides weekly guidance to support weight loss or strength-focused diets. • Science-backed calorie and macro targets • Automatic adjustments based on your intake • Works seamlessly as a smart macro tracker DAILY EXPENDITURE AND WEIGHT TREND Calog estimates your Total Daily Energy Expenditure (TDEE) using weight and nutrition history. It also provides Weight Trend insights that cut through daily fluctuations and show your real progress — essential for a reliable weight loss tracker. • Accurate calorie expenditure estimate • Weight Trend visualization • Helps you understand how diet changes affect results MONTHLY CALENDAR AND HABIT TRACKING See your meal logging habits at a glance with the monthly calendar. Track streaks, consistency, and trends in your daily calorie tracking and meal log. • Daily log indicators • Streak and habit insight • Visual progress patterns WHY USERS CHOOSE CALOG • Fastest AI-powered food tracker • Accurate calorie counter and macro tracker • Scan AI, barcode scanner, label recognition • Clean UI built for consistent meal logging • Personalized calorie and macro plans • Verified nutrition data you can trust • Helpful for weight loss, diet improvement, and balanced nutrition Calog gives you the clarity to understand your nutrition, the accuracy to stay on track, and the flexibility to build long-lasting, healthy habits. - Privacy Policy: https://buly.kr/28ujV3W - Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

FastOn

Features
Read full description

A fasting timer that lets you see what's happening inside your body — even without opening the app. FastOn helps you keep a 16-hour intermittent fast with a clean, focused timer. It works fully offline, needs no account, and keeps all your data on your device. VISUALIZE YOUR FAST As time passes, FastOn shows what's happening inside your body in real time: Digesting → Blood sugar → Fat burning → Ketosis → Autophagy → Growth hormone → Deep repair It's not just a countdown — knowing "fat burning starts soon" is what keeps you going. Tap any stage to learn the science behind it and what benefits to expect. FREE FEATURES - Start/stop a fast in one tap (backdate from your last meal) - Circular timer + real-time body stage - 16:8 plan - Streak tracking - Last 7 days of history - Water intake tracker - Mood & energy self-logging - Confetti celebration + SNS share card on completion PREMIUM - All plans (18:6 / 20:4 / OMAD / 5:2 / Custom) - Home screen Widget + Live Activity (remaining time & stage on Lock Screen and Dynamic Island) - Full statistics + insights - AI Advice (personalized tips based on your fasting patterns) - Weight tracking + goal weight line + HealthKit - 20 badges / achievements with categories - CSV data export - Eating window end & streak crisis notifications - No ads NOTE This app does not provide medical advice. Body-stage information is a general guideline based on common scientific knowledge and varies by individual. If you have a medical condition or are pregnant, please consult your doctor. SUBSCRIPTION - Monthly ¥480 / Yearly ¥2,900 (yearly includes a 7-day free trial) - Payment is charged to your Apple ID at confirmation. - It renews automatically unless auto-renew is turned off at least 24 hours before the end of the period. - Manage or cancel in Settings > Apple ID > Subscriptions. Terms of Use and Privacy Policy are available in the app settings and from the store links.

Screenshots

Calog4 screens
FastOn4 screens

Verdict

The call

The clearest difference is ads: Calog at none against FastOn's shown. On price, update cadence, 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. Calog sells 14 in-app purchases, starting at $9.99 per month and FastOn sells 3 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Calog ships an update every 4 days, FastOn every 3 days. The most recent releases landed on September 23, 2026 and September 21, 2026 respectively.

Scorecard1 real difference · 9 level
Calog versus FastOn: the parameters behind the verdict, then further details
ParameterCalogFastOn
PriceFreeFree
Rating4.7 (41 ratings) — better
Positive reviews80.6% of reviews
Number of ratings41 — better
Update frequencyEvery 4 daysEvery 3 days — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.115.0 — better
Further details — not scored
Size141 MB30 MB
Age rating4+4+
DeveloperGymwork Inc.Masahiro Akebi

In-app purchases

14 purchases

Calog

Subscriptions14
  • Calog PRO2 variants$9.991 Month
  • [Eligible Only] Calog PRO$19.991 Year
  • [Eligible Only] Calog PRO$29.991 Year
Show 11 more
  • Calog PRO$29.993 Months
  • [Eligible Only] Calog PRO$33.991 Year
  • [Eligible Only] Calog PRO$39.001 Year
  • [Eligible Only] Calog PRO2 variants$39.991 Year
  • Calog PRO7 Days trial2 variants$39.991 Year
  • [Eligible Only] Calog PRO$49.991 Year
  • Calog PRO7 Days trial$59.991 Year
  • Calog PRO$69.991 Year
  • Calog PRO$78.001 Year
  • Calog PRO7 Days trial$79.991 Year
  • Calog PRO$99.991 Year
3 purchases

FastOn

Subscriptions2
  • Premium (Monthly)$2.991 Month
  • Premium (Yearly)7 Days trial$17.991 Year
One-time1
  • Premium (Lifetime)$22.99

Questions

Is Calog free?
Calog is free to download, with in-app purchases available.
Is FastOn free?
FastOn is free to download, with in-app purchases available.
Do Calog or FastOn have ads?
FastOn shows ads; Calog does not.
Which is updated more often, Calog or FastOn?
Calog ships an update every 4 days, and FastOn every 3 days. Most recently, Calog was updated on September 23, 2026 and FastOn on September 21, 2026.

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