Comparison

Intermittent Fasting vs Intermittent

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

Head to head
About

Intermittent Fasting

This app tracks both your fasting periods and your eating windows, offering a unique dual-countdown feature. It visualizes metabolic phases like fat burning and ketosis, supports various fasting methods, and provides insights into your progress. It's designed to be user-friendly and privacy-conscious, working entirely offline.

Highlights
  • Eating window countdown
  • Fasting phases visualization
  • Support for multiple fasting methods
  • Streak tracking with grace periods
  • Pattern insights
  • Weight and BMI tracking
  • Smart notifications
  • 100% offline functionality
Features
Read full description

Free · Works offline · No account needed. JustFast is a simple intermittent fasting app and fasting timer for everyday use. Pick a 16:8, 18:6 or OMAD plan, tap start, and see how much time is left of your fast and of your eating window. No account and no long setup: your first fast starts in seconds. New to intermittent fasting? A plan like 16:8 means 16 hours of fasting followed by an 8-hour eating window. Many beginners start with 12:12 or 14:10 and move to 16:8 or 18:6 when it feels comfortable. JustFast explains each plan in plain words and lets you switch at any time. FREE FOREVER • The fasting timer and every plan, including open-ended and 36, 48 and 72-hour fasts • Reminders and the widget • Water tracking • History, fasting phases, edits and adding a past fast START IN SECONDS • Presets from 8 to 24 hours, including 12:12, 14:10, 16:8, 18:6 and 20:4 • OMAD (one meal a day, 23:1) • Extended 36, 48 and 72-hour fasts • Custom fasts of any length • Open-ended fasts that count up until you decide to stop • Edit the start time if you forgot to press start, or add a past fast later FASTING PHASES Follow the approximate phases of a fast, hour by hour, right on the timer. The phase times are general guidelines that vary from person to person. They are not medical advice. EATING WINDOW COUNTDOWN When a fast ends, JustFast counts down your eating window as well, so you always know how much time you have left to eat before your next fast. WEEKLY PLAN AND WEEKLY REVIEW Plan which days you fast and for how long. Each week, a short Weekly Review shows what you completed and suggests a calm next step. No guilt and no nagging. STREAKS, ACHIEVEMENTS AND HISTORY • Streaks with a grace period for busy days • Achievements for your milestones • A calendar plus 7-day and 30-day charts of your fasting hours • Export your history as a CSV file WEIGHT AND BMI Log your weight, follow your trend and BMI, and optionally sync your weight with Apple Health. REMINDERS AND WATER Optional reminders to start your fast and a notification when your fast is complete. You choose the time. Log a glass of water with one tap. PRIVATE AND SIMPLE • No account, no email, no sign-up needed • Your fasting and weight data stay on your iPhone unless you turn on cloud backup • Works offline • The timer screen is ad-free; small banners appear on secondary screens JUST FAST PLUS (OPTIONAL) Plus removes the ads and adds long-term Insights (90-day, 1-year and all-time trends, and fasting next to your weight) and cloud backup with sign-in. Plus is optional — pay once (Lifetime) or subscribe (Monthly or Yearly). Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period; manage or cancel them in your App Store account settings. WHO IT IS FOR • Beginners who want a clear fasting timer without a long questionnaire • People who follow 16:8, 18:6, 20:4 or OMAD and want a quick daily routine • Anyone who wants to track time-restricted eating without creating an account 32 LANGUAGES English, Arabic, Finnish, French, German, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, Spanish, Swedish, Turkish and 17 more. Whether you are trying intermittent fasting for the first time or you already follow 16:8, 18:6 or OMAD, JustFast keeps your fasting timer, your eating window and your history in one calm place. Download JustFast and start your first fast today. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Intermittent

This app tracks your fasting progress by showing real-time biological phases like ketosis and autophagy. It provides science-backed explanations for each stage and supports various fasting protocols without requiring an account or subscription.

Highlights
  • Real-time biological phase tracking (Fed, Lipolysis, Ketosis, Autophagy)
  • Support for multiple fasting protocols (12:12 to 72-hour fasts)
  • Free science library with cited primary sources
  • Adaptive hydration target
  • Weight and progress tracking with trend analysis
  • Private sharing circle with applause-only responses
  • Home screen widget and cross-device sync
Features
Read full description

The intermittent fasting timer that shows which fasting phase you have likely reached, from fat burning lipolysis to ketosis and autophagy, based on how long you have fasted. Ad free. No account required. Most fasting apps give you a countdown clock and a streak to protect. Intermittent does something different. It maps your hours fasted to the phases research describes, and explains the science behind each one with cited primary sources, not marketing copy. If you have ever wondered how to track fasting properly, or what is likely happening during a fast, this is the fasting tracker built for that question. WHY FASTING WORKS Intermittent fasting works because of what happens between meals, not just the absence of food. As your fast progresses, your body moves through distinct phases: burning through glucose reserves, shifting into fat burning lipolysis, entering ketosis, and eventually triggering autophagy, the cellular repair process linked to longevity and metabolic health. Understanding these transitions is what separates intentional fasting from guesswork. Intermittent maps every stage so your goals are grounded in biology, not motivation. KEY FEATURES PHASE AWARE FASTING TIMER A live timer that maps your fast to six phases: Fed, Early Fasting, Lipolysis, Ketosis, Autophagy, and Deep Fast. Each phase links to a free science article with primary sources cited. EVERY FASTING PROTOCOL, ONE APP Supports 12:12, 14:10, 16:8, 18:6, 20:4, OMAD (One Meal A Day), 36 hour, 48 hour, and 72 hour fasts. FREE FASTING SCIENCE LIBRARY A full library of fasting articles covering intermittent fasting, ketosis, autophagy, insulin response, and more. No subscription. No account. No paywall. SMART HYDRATION TARGET A science backed hydration goal that adapts to your weight, sex, age, and fasting duration. WEIGHT AND PROGRESS TRACKING Log your weight after each fast and track trends over time. Includes streak heatmap, phase reach history, and estimated fat vs glucose energy usage. PRIVATE CIRCLE AND END OF FAST REFLECTION Share your fast with a small private group. Applause only responses. No comparison. No gamification. HOME SCREEN WIDGET AND CROSS DEVICE SYNC Keep your fasting timer visible with a home screen widget. Your data syncs across devices privately without third party trackers. EATING WINDOW, REMINDERS AND RECAPS See your eating window after each fast, with an optional heads-up before it closes. Set your usual start time for a gentle reminder. Look back on each month and year with a recap you can share. WHO IT IS FOR Intermittent is built for adults who want to understand fasting, not be coached through it. If you follow research on metabolic health, read about longevity, or want a fasting routine grounded in biology rather than points or streaks, this app is for you. Suitable for both beginners and experienced fasters. HOW IT WORKS Choose your fasting protocol, from 12:12 to extended fasts Start your timer and see which phase you have likely reached Tap any phase to read the science and log your reflection at the end No account required to start. No subscription required to access the library.

Screenshots

Intermittent Fasting4 screens
Intermittent4 screens

Verdict

The call

The clearest difference is in-app purchases: Intermittent at none against Intermittent Fasting's 4. Intermittent also leads on ads (none vs shown) and ratings volume (48 vs 11). On price, rating, review sentiment and update cadence 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 sells 4 in-app purchases, starting at $2.99 per month. Intermittent asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Intermittent Fasting against 5.0 for Intermittent. Both are backed by a comparable volume of ratings — 11 and 48 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 weeks. Both last shipped on October 28, 2026.

Scorecard4 real differences · 6 level
Intermittent Fasting versus Intermittent: the parameters behind the verdict, then further details
ParameterIntermittent FastingIntermittent
PriceFreeFree
Rating4.9 (11 ratings)5.0 (48 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings1148 — better
Update frequencyEvery 2 weeksEvery 2 weeks
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationAd-supportedFree — better
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size126 MB47 MB
Age rating4+4+
DeveloperAdrian CabalaRohit Kumar

Customer experience

Intermittent Fasting

All ratings9 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Intermittent

All ratings48 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews15 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

4 purchases

Intermittent Fasting

Subscriptions3
  • Just Fast Plus monthly$2.991 Month
  • Just Fast Plus7 Days trial$14.991 Year
  • Just Fast Plus$14.991 Year
One-time1
  • Just Fast Plus Lifetime$29.99
None

Intermittent

No in-app purchases

Questions

Is Intermittent Fasting free?
Intermittent Fasting is free to download, with in-app purchases available.
Is Intermittent free?
Intermittent is free to download, with no in-app purchases.
Which has better reviews, Intermittent Fasting or Intermittent?
Intermittent is rated higher. Intermittent Fasting averages 4.9 out of 5 from 11 ratings, while Intermittent averages 5.0 from 48 ratings.
Do Intermittent Fasting or Intermittent have ads?
Intermittent Fasting shows ads; Intermittent does not.
Which is updated more often, Intermittent Fasting or Intermittent?
Intermittent Fasting ships an update every 2 weeks, and Intermittent every 2 weeks. Most recently, Intermittent Fasting was updated on October 28, 2026 and Intermittent on October 28, 2026.

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