Just Fast vs Fast
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Just Fast
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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Just Fast is the intermittent fasting timer that tracks both your fast and your eating window — a combination no other fasting app offers. Whether you're new to 16:8 or pushing into 20:4, OMAD, or custom schedules, Just Fast gives you a clear, distraction-free timer alongside the insights to understand what your body is doing and build habits that stick. EATING WINDOW COUNTDOWN — ONLY IN JUST FAST Most fasting apps tell you when your fast ends. Just Fast also tells you when your eating window closes. Know exactly how much time you have left to eat, so you stop overrunning your window by accident. KEY FEATURES • Eating Window Countdown — track when your eating window closes, not just when your fast ends • Fasting Phases — see fat burning, ketosis, and autophagy stages visualized in real time • All Major Fasting Methods — 16:8, 18:6, 20:4, OMAD, 14:10, 12:12, 24h, and custom durations • Streak Tracking with Grace Periods — maintain your momentum even on tough days • Pattern Insights — review your fasting history and discover your most consistent windows • Weight Tracking with BMI — log weight entries and track progress over time • Smart Notifications — reminders that support your schedule, not disrupt it • Beginner-Friendly Onboarding — choose your goal, fasting expertise, and preferred schedule in minutes • 100% Offline — no account, no signup, no cloud required • 15 Languages — English, German, French, Spanish, Polish, Portuguese, Italian, Japanese, Korean, Arabic, Russian, Swedish, Finnish, Norwegian, Turkish UNDERSTAND YOUR FAST, NOT JUST YOUR TIMER Just Fast visualizes the metabolic phases of fasting as they happen: fat burning begins around hour 12, ketosis deepens past hour 18, autophagy activates beyond hour 24. You do not need a biology degree — the app shows you where you are and what your body is doing. FREE AND LIGHTWEIGHT All core features are free. No subscription. No paywall. Just Fast is also one of the lightest full-featured fasting apps available — under 50MB download, compared to 200MB+ for most competitors. Fast to download, fast to start. Note: The app is free with light banner ads on secondary screens (history, settings). The main fasting timer screen is completely ad-free. PERFECT FOR • Beginners starting their first 16:8 protocol • Intermediate fasters exploring 18:6, 20:4, or OMAD • Anyone who wants fasting phases explained without complexity • People managing multiple fasting schedules across 15 languages • Privacy-conscious users who prefer no-account apps Download Just Fast and start your first fast today — no signup required. --- Privacy Policy: https://justfast.app/privacy Support: support@justfast.app
Fast
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Start intermittent fasting today with Fast-E - a beautifully designed fasting timer that puts your privacy first. Every feature is completely free. No subscriptions, no ads, no account required. SIMPLE FASTING TIMER Choose from popular preset schedules - 16:8, 18:6, 20:4, or OMAD - or create your own custom fasting window. Start your fast with a single tap. A beautiful animated ring shows your progress in real time, counting down to your eating window. CUSTOM SCHEDULES Create personalized fasting schedules with any fasting-to-eating ratio. Whether you prefer 14:10, 12:12, or any other split, Fast-E adapts to your routine. TRACK YOUR PROGRESS View detailed statistics including total fasts completed, average duration, completion rate, and weekly activity. Interactive charts help you spot trends and stay motivated. BUILD YOUR STREAK Keep your momentum going with streak tracking. See how many consecutive days you've completed your fasting goal and push yourself to keep the chain going. FULL FASTING HISTORY Every fast is recorded and stored on your device. Browse your complete history, see which sessions you completed, and track your journey over time. HOME SCREEN WIDGETS Add Fast-E widgets to your home screen to see your fasting progress at a glance without opening the app. SMART NOTIFICATIONS Get reminders when your fasting window starts, when it's time to eat, and when you're halfway through. Customize notification timing to match your routine. YOUR PRIVACY MATTERS All your data stays on your device. No account creation, no cloud sync, no data collection, no analytics tracking. Fast-E works entirely offline. 100% FREE Every feature in Fast-E is available at no cost. No premium tier, no feature gates, no in-app purchases. Just download and start fasting.
Screenshots
Verdict
The clearest difference is ads: Fast at none against Just Fast's shown. Fast also leads on update cadence (every 2 days vs every 3 weeks). Just Fast's advantage is iOS requirement (14.0 vs 17.0). On price, in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Just Fast ships an update every 3 weeks, Fast every 2 days. The most recent releases landed on September 20, 2026 and September 12, 2026 respectively.
| Parameter | Just Fast | Fast |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (7 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 7 — better | — |
| Update frequency | Every 3 weeks | Every 2 days — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 47 MB | 6 MB |
| Age rating | 17+ | 4+ |
| Developer | Adrian Cabala | Invotek AS |
In-app purchases
Just Fast
No in-app purchases
Fast
No in-app purchases









