Comparison

InFuel vs FastFlex Fasting Tracker

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

Head to head
About

InFuel

Features
Read full description

Fuel from within. Transform your body, sharpen your mind, and unlock your full potential—one fast at a time. InFuel is your personal AI-powered fasting coach designed to guide you through 24, 48, 72, and 100-hour fasts with science-backed insights, real-time body updates, and motivational support every step of the way. Whether new to fasting or leveling up your current routine, InFuel keeps you informed, inspired, and in control. - - - - - - - - f e a t u r e s Custom Fast Timer -- Start, pause, or complete your fast anytime. Track your progress hour-by-hour with a clean, minimalist timer designed to keep you focused. Real-Time Body Insights -- Know exactly what’s happening in your body as you fast—ketosis, autophagy, fat-burning, and more. InFuel delivers detailed updates based on your current hour of fasting. AI-Powered Fasting Coach -- Ask questions, get encouragement, or dive into the science behind fasting with your personal AI coach, available 24/7. Smart Reminders -- Get hydration alerts, motivational quotes, and helpful tips—timed around your fasting schedule and sleep preferences. Learn View -- Explore swipeable cards packed with knowledge about fasting safety, the stages of fat-burning, autophagy, and refeeding guidance. Sleep-Aware Notifications -- InFuel adjusts to your sleep schedule so you can rest without unnecessary alerts. Refeed Guidance -- Finish strong. InFuel provides safe, smart recommendations for breaking your fast to avoid bloating and discomfort. Fasting isn’t about going without—it’s about going within. InFuel is built to help you find clarity, discipline, and strength through intentional fasting. Download InFuel today and take the first step toward mastering your fast—one hour at a time.

About

FastFlex Fasting Tracker

This app helps you visualize your intermittent fasting progress with a unique visual tracker. It offers various fasting schedules, comprehensive tracking tools, and motivational milestones to keep you engaged. Designed for both beginners and experienced fasters, it focuses on privacy and a clean, intuitive interface.

Highlights
  • Visual progress tracking
  • Multiple fasting schedules
  • Customizable fasting durations
  • Fasting timer with milestones
  • Journal for insights
  • Weight tracking
  • Color-coded history
Features
Read full description

FASTFLEX - YOUR FASTING TRACKER REIMAGINED Transform your fasting journey with FastFlex, the intuitive fasting tracker that turns willpower into visual progress. Whether you're practicing intermittent fasting for health, weight loss, or mental clarity, FastFlex makes every hour count. VISUALIZE YOUR PROGRESS Watch your willpower literally conquer hunger with our unique progress visualization. Every passing hour brings you closer to your goal, with dynamic milestones that celebrate your dedication along the way. FLEXIBLE FASTING OPTIONS - Popular fasting schedules: 12:12, 16:8, 18:6, 20:4, OMAD (23:1) - Custom fasting durations for your personal goals - Easy start time adjustment for perfect flexibility - Track multiple fasts with complete history COMPREHENSIVE TRACKING - Fasting Timer: Real-time countdown with milestone celebrations - Journal: Document your fasting experiences, energy levels, and insights - Weight Tracking: Monitor your progress with visual goal tracking - History: Calendar and list views of all your completed fasts MOTIVATIONAL MILESTONES FastFlex keeps you engaged with dynamic milestones throughout your fast: - Digesting phase - Early Fasting benefits - Glycogen Burning begins - Fat Burning accelerates - Ketosis achievement - Autophagy activation Each milestone shows exactly what's happening in your body, keeping you informed and motivated. SMART FEATURES - Color-coded history: Instantly see completed vs. broken fasts - Backdate fasts: Add historical fasts you've completed - Goal celebrations: Special recognition when you exceed targets - Local notifications: Get notified when you reach your goals - iCloud backup: Your data syncs automatically across devices PRIVACY FIRST FastFlex respects your privacy: - All data stored locally on your device - No accounts required - No tracking or data collection - Automatic iCloud backup for peace of mind DESIGNED FOR SUCCESS We built FastFlex with one goal: help you succeed at fasting. The interface is clean, intuitive, and focused on what matters - your progress. No clutter, no confusion, just powerful tracking that keeps you motivated. PERFECT FOR: - Intermittent fasting beginners - Experienced fasters seeking better tracking - Weight loss journeys - Health optimization - Mental clarity and focus - Metabolic health improvement SUBSCRIPTION FEATURES FastFlex Premium gives you full access to: - Unlimited fasting tracking - Complete journal with unlimited entries - Advanced weight tracking with progress visualization - Full history with calendar and list views - All current and future features JOIN THE FASTFLEX COMMUNITY Thousands of users are already transforming their health with FastFlex. Whether you're just starting intermittent fasting or you're a seasoned faster, FastFlex provides the tools and motivation you need to succeed. Download FastFlex today and discover how powerful visual progress can transform your fasting experience. --- SUBSCRIPTION DETAILS: - Monthly: $0.99/month - Annual: $9.99/year (Save 16%!) - Cancel anytime - Payment charged to iTunes Account at confirmation of purchase - Subscription automatically renews unless auto-renew is turned off at least 24 hours before the end of the current period - Account will be charged for renewal within 24 hours prior to the end of the current period - Subscriptions may be managed and auto-renewal may be turned off in Account Settings after purchase Privacy Policy: https://orkhanhasanbeck.github.io/fastflex-support/privacy.html Terms of Service: https://orkhanhasanbeck.github.io/fastflex-support/terms.html

Screenshots

InFuel4 screens
FastFlex Fasting Tracker4 screens

Verdict

The call

The clearest difference is in-app purchases: InFuel at none against FastFlex Fasting Tracker's 2. FastFlex Fasting Tracker's advantage is update cadence (every 3 weeks vs every 10 months) and iOS requirement (15.1 vs 18.0). On price, ads 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. FastFlex Fasting Tracker sells 2 in-app purchases, starting at $0.99 per month. InFuel asks for nothing beyond the download.

UpkeepUpdate frequency

InFuel ships an update every 10 months, FastFlex Fasting Tracker every 3 weeks. The most recent releases landed on September 17, 2026 and June 1, 2026 respectively.

Scorecard3 real differences · 7 level
InFuel versus FastFlex Fasting Tracker: the parameters behind the verdict, then further details
ParameterInFuelFastFlex Fasting Tracker
PriceFreeFree
Rating—5.0 (2 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—2 — better
Update frequencyEvery 10 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhoneiPhone, iPod — better
Requires iOS18.015.1 — better
Further details — not scored
Size2 MB44 MB
Age rating4+4+
DeveloperFishybear LLCOrkhan Hasanbeck

In-app purchases

None

InFuel

No in-app purchases

2 purchases

FastFlex Fasting Tracker

Subscriptions2
  • FastFlex Premium Monthly$0.991 Month
  • FastFlex Premium Annual$9.991 Year

Questions

Is InFuel free?
InFuel is free to download, with no in-app purchases.
Is FastFlex Fasting Tracker free?
FastFlex Fasting Tracker is free to download, with in-app purchases available.
Do InFuel or FastFlex Fasting Tracker have ads?
Neither InFuel nor FastFlex Fasting Tracker shows ads.
Which is updated more often, InFuel or FastFlex Fasting Tracker?
InFuel ships an update every 10 months, and FastFlex Fasting Tracker every 3 weeks. Most recently, InFuel was updated on September 17, 2026 and FastFlex Fasting Tracker on June 1, 2026.

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