Intermittent Fasting vs JustFast
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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/
JustFast
This app offers a straightforward intermittent fasting timer. It focuses on tracking your fast with a clear, calm interface, providing insights into metabolic stages without gamification or pressure. It prioritizes privacy with on-device data storage and no accounts.
- One-tap start and stop
- Live timer with accurate timekeeping
- Metabolic milestone tracking
- Plain-language explanations of milestones
- Adjustable start/stop times
- Ongoing notification for duration
- Simple history of past fasts
- 18 languages and dark design
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Fasting is a beautifully simple intermittent-fasting timer that does one thing well: it tracks your fast. No goals to hit. No streaks to protect. No accounts, no ads, no clutter. Just tap once to begin, and a calm live timer counts your fast while a glowing ring fills toward the next stage your body moves through. WHY IT'S DIFFERENT Most fasting apps pile on dashboards, reminders, and pressure. This one strips fasting back to its essence — a clear timer you can glance at and put away. It's designed to feel quiet and focused, not gamified. WHAT YOU GET • One-tap start and stop, with a big, satisfying button • A live timer that keeps perfect time across restarts, time-zone changes, and daylight saving • Metabolic milestones — the ring fills toward the next stage (blood sugar settling, glycogen burning, fat burning, ketosis, autophagy, and more) • Tap any milestone for an honest, plain-language explanation of what's happening in your body • Forgot to start the timer? Just tap the ring to fix your start time. Forgot to stop? End your fast at the right time after the fact. • An ongoing notification shows your current duration at a glance • A simple history of past fasts — swipe to delete • 18 languages and a clean dark design HONEST BY DESIGN The milestone descriptions are written plainly and honestly. Where the science is still early or based mostly on animal research, we say so. This app is a timer and an educational companion — not medical advice. PRIVATE BY DEFAULT Your data stays on your device. There are no accounts, no sign-ups, no tracking, and nothing is uploaded. Fasting works for 16:8, OMAD, alternate-day, extended fasts, or any schedule you like — because it never forces a schedule on you. Note: Fasting is not a medical device and does not provide medical advice. Talk to a healthcare professional before starting any fasting regimen, especially if you are pregnant, nursing, taking medication, or have a medical condition.
Screenshots
Verdict
The clearest difference is rating: Intermittent Fasting at 5.0 against JustFast's 4.5. Intermittent Fasting also leads on ratings volume (9 vs 2) and device support (4 vs 2). JustFast's advantage is in-app purchases (none vs 4) and ads (none vs shown). On price 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
Both are free to download. Intermittent Fasting sells 4 in-app purchases, starting at $2.99 per month. JustFast asks for nothing beyond the download.
Intermittent Fasting holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 9 and 2 respectively.
Intermittent Fasting ships an update every 2 weeks, JustFast fortnightly. Both last shipped on October 24, 2026.
| Parameter | Intermittent Fasting | JustFast |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (9 ratings) — better | 4.5 (2 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 9 — better | 2 |
| Update frequency | Every 2 weeks | Fortnightly — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 126 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | Adrian Cabala | Vitalii Vyrodov |
Customer experience
Intermittent Fasting
JustFast
In-app purchases
Intermittent Fasting
- Just Fast Plus monthly$2.991 Month
- Just Fast Plus7 Days trial$14.991 Year
- Just Fast Plus$14.991 Year
- Just Fast Plus Lifetime$29.99
JustFast
No in-app purchases
Questions
Is Intermittent Fasting free?
Is JustFast free?
Which has better reviews, Intermittent Fasting or JustFast?
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