Comparison

fast_burn vs VibeCal AI

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

Head to head
About

fast_burn

Features
Read full description

Fasting made simple. FastBurn shows what's happening in your body as you fast - from fat burning to autophagy - so every hour feels like progress. FASTING TIMER One tap to start. A ring UI tracks your elapsed time and body phase: blood sugar rising, fat burning, ketosis, autophagy. PLANS THAT FIT YOU Your goal, body type, and experience determine the best protocol: - 16:8 (16h fast / 8h eat) - 18:6 (18h fast / 6h eat) - 20:4 (20h fast / 4h eat) - 36-hour extended fast WEIGHT TRACKING + APPLE HEALTH Log weight and view trends. Syncs automatically with Apple Health. STATS & CALENDAR Total fasts, average duration, best streak - all at a glance. Calendar view shows your daily history. SMART REMINDERS Customize alerts for fast start, phase changes, and eating windows. FREE FEATURES - 16:8 fasting timer - Fasting history & basic stats - Weight log PRO FEATURES - All fasting plans (18:6, 20:4, 36h) - Detailed body phase tracking - Full statistics & trend charts - Fasting calendar - Unlimited fasting history SUBSCRIPTION DETAILS FastBurn Pro is an auto-renewable subscription. - Annual plan: includes a 7-day free trial - Monthly plan - Payment is charged to your Apple ID at confirmation - Subscription auto-renews unless canceled at least 24 hours before the current period ends - Unused portion of a free trial is forfeited upon purchase - Manage or cancel: Settings > Apple ID > Subscriptions Terms of Use: https://fastburn-legal.vercel.app/terms.html

About

VibeCal AI

Features
Read full description

VibeCal turns calorie tracking into something you'll actually stick with. Just snap a photo of your meal โ€” our AI identifies the food, estimates the portion, and logs calories and macros in seconds. No more digging through giant food databases. WHAT YOU GET โ€ข AI Food Scan โ€” photograph any meal for instant calories, protein, carbs, fat, and key micronutrients. โ€ข A Target Built For You โ€” we calculate your daily calories and macros from your age, height, weight, goal, and activity using the proven Mifflin-St Jeor method. โ€ข Track Your Progress โ€” weight trends, body measurements, and before/after progress photos in one place. โ€ข Stay On Track โ€” water logging, daily streaks, and home & lock-screen widgets so logging takes one tap. โ€ข Meal Ideas โ€” get meal suggestions that fit your remaining macros and budget. โ€ข Apple Health โ€” optionally sync steps and energy to sharpen your target. PREMIUM Free accounts get 3 AI scans per day plus unlimited manual logging. Upgrade to Premium for unlimited scans. VibeCal is a general wellness app, not medical advice. Calorie estimates are approximate. If you have a medical condition, are pregnant, under 18, or have a history of disordered eating, talk to a clinician before changing your diet. SUBSCRIPTION & LEGAL VibeCal Premium is an auto-renewing subscription, offered as weekly, monthly, or annual plans. The price is shown in the app before you purchase. Payment is charged to your Apple ID at confirmation and renews automatically unless auto-renew is turned off at least 24 hours before the end of the current period. You can manage or cancel anytime in your Apple ID Account Settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://ahmadahmad021117-oss.github.io/Vibe-AI-/privacy.html

Screenshots

fast_burn4 screens
VibeCal AI4 screens

Verdict

The call

fast_burn and VibeCal AI are too close to call on the numbers: across 6 compared parameters โ€” price, update cadence, ads and in-app purchases among them โ€” neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. fast_burn sells 2 in-app purchases, starting at $4.99 per month and VibeCal AI sells 2 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

fast_burn ships an update every 8 days, VibeCal AI every 9 days. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

ScorecardNo meaningful differences
fast_burn versus VibeCal AI: the parameters behind the verdict, then further details
Parameterfast_burnVibeCal AI
PriceFreeFree
Update frequencyEvery 8 days โ€” betterEvery 9 days
AdsNoNo
In-app purchasesYesYes
DevicesiPhoneiPhone
Requires iOS17.017.0
Further details โ€” not scored
Size1 MB13 MB
Age rating12+12+
DeveloperKeiichiro HayashidaAhmad Ahmad

In-app purchases

2 purchases

fast_burn

Subscriptions2
  • FastBurn Pro (Monthly)$4.991 Month
  • FastBurn Pro (Annual)7 Days trial$29.991 Year
2 purchases

VibeCal AI

Subscriptions2
  • Premium Weekly3 Days trial$6.997 Days
  • Premium Yearly3 Days trial$39.991 Year

Questions

Is fast_burn free?
fast_burn is free to download, with in-app purchases available.
Is VibeCal AI free?
VibeCal AI is free to download, with in-app purchases available.
Do fast_burn or VibeCal AI have ads?
Neither fast_burn nor VibeCal AI shows ads.
Which is updated more often, fast_burn or VibeCal AI?
fast_burn ships an update every 8 days, and VibeCal AI every 9 days. Most recently, fast_burn was updated on October 28, 2026 and VibeCal AI on October 25, 2026.

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