9toFast vs Fasting Window
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
9toFast
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9toFast is a clean and intuitive intermittent fasting app designed to help you stay consistent without pressure. Whether youβre fasting for better focus, energy, or health, 9toFast makes it easy to track your progress and feel in control. Stay on track effortlessly β’ Smart fasting timer: Start, pause, or end your fasts anytime and watch your fasting ring fill in real-time. β’ Custom fasting plans: Choose from popular plans like 16:8 or 18:6, or set your own window. β’ Progress dashboard: Visualise your streaks and completion rates at a glance. β’ Personalised themes: Match your app to your mood with sleek light and dark options. β’ Simple insights: See how your fasting habits evolve over time with easy-to-read stats. Why users love 9toFast β’ Minimal design that keeps fasting simple β’ No clutter, ads, or confusing features β’ Built for balance, not restriction Perfect for beginners and pros Whether youβre new to fasting or have been doing it for years, 9toFast adapts to your lifestyle. Track your fasts, stay consistent, and celebrate small wins daily. Coming soon β’ Weight tracking β’ Calorie Counting β’ Meal Logging β’ Health app integrations β’ Fasting challenges β’ Custom reminders and streak rewards Start your fasting journey today with 9toFast: the fasting tracker thatβs simple, motivating, and built for real life.
Fasting Window
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Record your fasting time with a simple timer. TRACK YOUR TIME β’ Select 16:8, 18:6, 20:4, OMAD, or the Custom preset β’ Circular progress ring with elapsed-time ranges β’ Notification at your selected time goal, when permission is granted KEEP YOUR RECORDS β’ Local fasting history and streak count β’ Existing weight records remain stored on your device SAFETY INFORMATION The timer does not measure metabolism, ketosis, or autophagy. It does not diagnose conditions or provide medical advice. Goals are personal settings, not recommendations to fast longer. Talk with your healthcare provider before trying fasting, especially if you are under 25, pregnant or breastfeeding, or taking medication. Source: NIH News in Health, December 2019; https://newsinhealth.nih.gov/2019/12/fast-or-not-fast
Screenshots
Verdict
The clearest difference is in-app purchases: Fasting Window at none against 9toFast's 3. Fasting Window also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.1). 9toFast's advantage is update cadence (fortnightly vs every 4 months). On price and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. 9toFast sells 3 in-app purchases, starting at $0.99 per month. Fasting Window asks for nothing beyond the download.
9toFast ships an update fortnightly, Fasting Window every 4 months. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.
| Parameter | 9toFast | Fasting Window |
|---|---|---|
| Price | Free | Free |
| Update frequency | Fortnightly β better | Every 4 months |
| Ads | Yes | No β better |
| In-app purchases | Yes | No β better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 13.0 β better |
| Further details β not scored | ||
| Size | 47 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | Esther Yekini | HeungYeol Kim |
In-app purchases
9toFast
- Premium Monthly$0.991 Month
- Premium Yearly$9.991 Year
- Premium Lifetime$19.99
Fasting Window
No in-app purchases









