Comparison

FastFlex Fasting Tracker vs ONE

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

Head to head
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

About

ONE

This app simplifies intermittent fasting with a one-tap timer and progress tracker. It guides users through fasting stages, offers various plans, and provides insights into body changes. The focus is on building consistent habits without unnecessary complexity.

Highlights
  • One-tap fasting timer
  • Live fasting stage tracking
  • Multiple fasting plan options
  • Daily streak tracking
  • Weight and water tracking
  • AI-powered progress summaries
  • Offline functionality
Features
Read full description

Fasting made simple. Start a fast in one tap, watch your body move through each stage, and build the streak that actually changes things. ONE is an intermittent fasting tracker for people who want the habit, not the homework. No account. No clutter. Just the timer, the stages, and your progress. CHOOSE YOUR PLAN • 12:12, 14:10, 16:8, 18:6, 20:4 and OMAD (23:1) • Flexi mode for open-ended fasts • A difficulty rating on every plan, so you pick one you'll actually keep • Custom Timer for any length you like — free, no upgrade • Change plan any time. Nothing is locked in. WATCH WHAT'S HAPPENING • Live fasting stages: blood sugar falling, fat burning, ketosis, autophagy • Know exactly when the next stage arrives • Plain-language explanation of what your body is doing, and why STAY ON TRACK • Reminders when your fast starts and ends • A notification as you reach each new stage • Fix your start or end time when life happens • Daily streaks that reward consistency, not perfection • Apple Health: your fasts written out, your weight read in — free SEE YOUR PROGRESS • Every fast logged automatically, nothing to fill in • Your recent fasts, free forever WHAT ONE PREMIUM ADDS • Your full fasting history, not just the last few • AI Coach — weekly and monthly written analysis of how you actually fast, what changed, and what to try next • Trends: streak calendar, fasting-hours charts and weight trend • Protein tracker, with a daily target set from your weight • Water tracking against a goal, right on the timer • Your own Quick Start lengths, tuned to the fasts you really do • Apple Watch app with complications — start and end a fast from your wrist • Home Screen widget and a Live Activity on your Lock Screen The timer, every plan, the stages and the Custom Timer are free. Forever. BUILT TO STAY OUT OF THE WAY • Start fasting in under a minute — no sign-up, no email • Optional account, so your history follows you to a new phone SUBSCRIPTION ONE Premium is an auto-renewing subscription, available monthly or annually. Payment is charged to your Apple Account at confirmation of purchase. It renews automatically unless cancelled at least 24 hours before the end of the current period, and your account is charged for renewal within 24 hours of the end of that period. Manage or cancel any time in your Apple Account settings. Medical disclaimer: ONE is for general wellness only and does not provide medical advice. Talk to a qualified healthcare professional before starting any fasting programme, particularly if you are pregnant, breastfeeding, diabetic, under 18, or have a history of disordered eating. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.fastingtime.co/privacy

Screenshots

FastFlex Fasting Tracker4 screens
ONE4 screens

Verdict

The call

The clearest difference is device support: ONE at 4 against FastFlex Fasting Tracker's 2. On price, rating, review sentiment and ratings volume 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 and ONE sells 6 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for FastFlex Fasting Tracker against 5.0 for ONE. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

FastFlex Fasting Tracker ships an update every 3 weeks, ONE every 4 weeks. The most recent releases landed on October 7, 2026 and October 17, 2026 respectively.

Scorecard1 real difference · 9 level
FastFlex Fasting Tracker versus ONE: the parameters behind the verdict, then further details
ParameterFastFlex Fasting TrackerONE
PriceFreeFree
Rating5.0 (2 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings2 — better1
Update frequencyEvery 3 weeks — betterEvery 4 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFreemium
DevicesiPhone, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS15.115.1
Further details — not scored
Size44 MB49 MB
Age rating4+17+
DeveloperOrkhan HasanbeckCreate Rush

Customer experience

FastFlex Fasting Tracker

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

ONE

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

2 purchases

FastFlex Fasting Tracker

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

ONE

Subscriptions6
  • Standard Weekly$2.997 Days
  • Premium Weekly$4.997 Days
  • Standard Monthly$4.991 Month
Show 3 more
  • Premium Monthly$9.991 Month
  • Standard Yearly$49.991 Year
  • Premium Yearly$99.991 Year

Questions

Is FastFlex Fasting Tracker free?
FastFlex Fasting Tracker is free to download, with in-app purchases available.
Is ONE free?
ONE is free to download, with in-app purchases available.
Which has better reviews, FastFlex Fasting Tracker or ONE?
FastFlex Fasting Tracker and ONE are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.
Do FastFlex Fasting Tracker or ONE have ads?
Neither FastFlex Fasting Tracker nor ONE shows ads.
Which is updated more often, FastFlex Fasting Tracker or ONE?
FastFlex Fasting Tracker ships an update every 3 weeks, and ONE every 4 weeks. Most recently, FastFlex Fasting Tracker was updated on October 7, 2026 and ONE on October 17, 2026.

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