Comparison

Intermittent Fasting Timer IF vs Fast12

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

Head to head
About

Intermittent Fasting Timer IF

Track your intermittent fasting progress with a smart timer that visualizes metabolic zones. Offers multiple fasting types, live activity updates, and personalized insights to help you build lasting habits.

Highlights
  • Metabolic zone visualization
  • Live Activity and Dynamic Island integration
  • Multiple fasting types (16:8, 20:4, OMAD, etc.)
  • Intelligent timer and scheduling
  • Achievement system for habit building
  • Detailed fasting history and analytics
  • HealthKit integration
Features
Read full description

Transform Your Health with Smart Intermittent Fasting Fasting revolutionizes your health journey with intelligent tracking, personalized insights, and seamless automation. FASTING ZONES - TRACK YOUR METABOLIC STATE Visualize your body's metabolic phases as you fast: • Fed State (0-4h) - Digestion and nutrient absorption • Catabolic (4-8h) - Blood sugar normalizes, fat mobilization begins • Fat Burning (8-12h) - Body switches to burning stored fat • Ketosis (12-18h) - Ketone production increases for energy • Deep Ketosis (18-24h) - Enhanced fat burning and mental clarity • Autophagy (24h+) - Cellular cleanup and renewal LIVE ACTIVITIES AND DYNAMIC ISLAND • Live Activity on your lock screen shows elapsed time • Dynamic Island displays your fasting progress at a glance • See your current metabolic zone without opening the app SMART FASTING SYSTEM • Multiple Fasting Types - 16:8, 18:6, 20:4, OMAD, 24h, 36h, and custom • Intelligent Timer - Tracks fasting and eating windows precisely • Calendar Integration - Smart scheduling based on your events • Achievement System - Unlock milestones and build lasting habits POWERFUL TRACKING • Real-time fasting timer with visual progress rings • Detailed fasting history and statistics • Weekly and monthly analytics dashboards • Streak tracking and weight trends SEAMLESS AUTOMATION • Smart Notifications for fasting start/end times • iCloud Sync across all your devices • Widget Support for quick status checks • Background Tracking continues when app is closed PERSONALIZED EXPERIENCE • Interactive Tutorial to learn how the app works • Custom Fasting Plans that fit your lifestyle • Health Integration with HealthKit FREE FEATURES: • Up to 3 active fasting sessions • Basic fasting types (16:8, 18:6) • Timer and notifications • iCloud sync PREMIUM FEATURES (Additional Purchase): • Unlimited sessions and history • Advanced fasting types • Advanced analytics • Weight tracking and trends • Data export Perfect for beginners and experienced fasters alike. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Fast12

Build a sustainable fasting routine with a simple timer and personalized coaching. Track your fasting window, hydration, and sleep to understand your body's rhythms. Features AI meal scanning and meal guidance to support your eating window.

Highlights
  • Simple fasting timer
  • Beginner-friendly 12-hour fast
  • Smart fasting insights
  • Personal coaching
  • Hydration tracking
  • AI Meal Photo Scanner
  • Apple Watch support
Features
Read full description

Fast12 helps you build a simple, sustainable fasting routine - starting with the easiest win: a 12-hour overnight fast. Close the kitchen at night, wake up feeling more in control, and build a healthy rhythm without extreme diets, complicated meal rules, or constant calorie maths. Whether you are new to intermittent fasting or want a calmer way to stay consistent, Fast12 gives you the tools to track your fasting window, understand your body, and make better daily choices. WHY FAST12? • Simple fasting timer Start, pause, complete and track your fasting windows with a clear, easy-to-use timer. • Beginner-friendly 12-hour fasting Fast12 is built around a gentle overnight fasting routine, helping you create consistency before chasing longer fasting windows. • Smart fasting insights See how your sleep, hydration, weight, energy and fasting habits connect over time. • Personal coaching Get guidance designed to help you improve your routine, stay consistent, and understand what may be affecting your progress. • Hydration tracking Log water, set daily goals, and spot when thirst may be mistaken for hunger. • Sleep and recovery insights Understand how sleep quality may influence cravings, energy and fasting consistency. • Ai Meal Photo Scanner Snap a quick photo to automatically estimate calories and log your daily meals. • Meal guidance Access fasting-friendly meal ideas and fast-breaking guidance to support your eating window. • Progress and streaks Build momentum with streaks, milestones and progress tracking that help you stay motivated. • Apple Watch support Track your fast from your wrist and keep your routine visible throughout the day. • Widgets, Live Activities and Dynamic Island Follow your fasting progress from your Home Screen, Lock Screen or Dynamic Island. • Privacy-first by design Your health and fasting data stays on your device. No account required. FASTING MADE SIMPLE Fast12 is not about perfection. It is about building one repeatable habit: finish eating, rest, sleep, and start again in the morning. Use Fast12 to: • Track 12:12, 14:10, 16:8 and other fasting schedules • Log meals instantly with AI photo scanning • Reduce late-night snacking • Build a consistent eating rhythm • Monitor hydration, sleep, energy and weight trends • Understand your fasting phases • Stay motivated with streaks and achievements • Get personalised insights based on your routine • Use Apple Watch, widgets and Live Activities for easy tracking BUILT FOR REAL LIFE Many fasting apps focus on advanced fasting windows, strict challenges or complicated routines. Fast12 is designed for people who want a simpler first step. Start with a realistic overnight reset. Build consistency. Then adjust your fasting schedule when you are ready. IMPORTANT HEALTH INFORMATION Fast12 is a wellness and habit-tracking app. It does not provide medical advice, diagnosis or treatment. Intermittent fasting is not suitable for everyone, including some people who are pregnant, breastfeeding, under 18, underweight, have a history of eating disorders, or have certain medical conditions. Speak to a qualified healthcare professional before starting intermittent fasting, changing your diet, or using Fast12 for weight management. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://fast12.d-app.online/privacy.html

Screenshots

Intermittent Fasting Timer IF4 screens
Fast124 screens

Verdict

The call

The clearest difference is review sentiment: Fast12 at 100% against Intermittent Fasting Timer IF's 0%. Fast12 also leads on update cadence (every 10 days vs every 3 months). On price, ads, in-app purchases and monetization model 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. Intermittent Fasting Timer IF sells 3 in-app purchases, starting at $2.99 per month and Fast12 sells 2 in-app purchases, starting at $12.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Intermittent Fasting Timer IF ships an update every 3 months, Fast12 every 10 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 8 level
Intermittent Fasting Timer IF versus Fast12: the parameters behind the verdict, then further details
ParameterIntermittent Fasting Timer IFFast12
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews0.0% of reviews100.0% of reviews — better
Number of ratings1 — better—
Update frequencyEvery 3 monthsEvery 10 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFreemium
DevicesiPhoneiPhone, Apple Watch — better
Requires iOS26.026.0
Further details — not scored
Size23 MB29 MB
Age rating4+17+
DeveloperJeff CedillaD App Online Ltd

Customer experience

Intermittent Fasting Timer IF

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Fast12

Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

Intermittent Fasting Timer IF

Subscriptions2
  • Monthly$2.991 Month
  • Yearly$6.991 Year
One-time1
  • Lifetime$9.99
2 purchases

Fast12

Subscriptions2
  • Fast12 Premium Monthly$12.991 Month
  • Fast12 Premium Annual7 Days trial$49.991 Year

Questions

Is Intermittent Fasting Timer IF free?
Intermittent Fasting Timer IF is free to download, with in-app purchases available.
Is Fast12 free?
Fast12 is free to download, with in-app purchases available.
Do Intermittent Fasting Timer IF or Fast12 have ads?
Neither Intermittent Fasting Timer IF nor Fast12 shows ads.
Which is updated more often, Intermittent Fasting Timer IF or Fast12?
Intermittent Fasting Timer IF ships an update every 3 months, and Fast12 every 10 days. Most recently, Intermittent Fasting Timer IF was updated on November 5, 2026 and Fast12 on October 31, 2026.

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