Fastin vs Kainkript
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Fastin
This app guides you through intermittent fasting for weight loss and improved health. It offers personalized plans, tracking tools for food, weight, water, sleep, and activity, along with educational courses on fasting and nutrition. Visualize your progress with detailed statistics to stay motivated on your journey.
- Personalized fasting plans
- Food, weight, water, sleep, and activity tracking
- Fasting and nutrition courses
- Progress statistics and charts
- Step-by-step fasting guidance
- Meal journal for mindful eating
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Do you know how to lose weight and keep it for a lifetime? We have no way to exercise for 3 hours a day, weigh food, and count calories anytime. But we can control when to eat to Lose Weight which is FASTING. All you need to do is shift eating time to lose weight. The most popular and healthy way to lose weight from our wise ancients. Let’s guide you on how to start your fasting journey. Fastin: Intermittent Fasting is a simple fasting app, a powerful weight-loss tool. Lose weight, improve your health and simplify your lifestyle. Intermittent fasting has a powerful effect on your body and brain and may help you live a longer, healthier life. Intermittent fasting(IF) doesn’t specify which foods you should eat, but rather when you should eat them. Learn the science behind intermittent fasting(IF) so you can use it to achieve your goals. LIVE LONGER & LOOK BETTER HOW WE HELP YOU MASTER INTERMITTENT FASTING Fasting guidance A step-by-step guide to intermittent fasting Smart and flexible tracking tools that adapt to your needs Body status shows you what’s happening to your body when fasting Personalized fasting plans based on your body condition (6 plans available) Fasting Tools Food Tracker: log every meal and snack, view food values and trends and gain insights into our nutrition course Weight Tracker: record weight changes to reach your ideal weight Water Tracker: track consumption and stay hydrated Sleep tracker: aim to sleep to lose more weight Activity Tracker: track daily activity and motivate yourself to move a little more Reminders: hit every mini-goal to reach your dream target Fasting & Nutrition Courses Knowledge library for intermittent fasting and nutrition Professional content on nutrition, learn to choose the right foods Easy-to-use meal journal for mindful eating Boost your immune system, become stronger than ever Fasting Statistics(For insights & motivation) Visualize your fasting process and track changes in charts Reveal the patterns of your fasting process and body performance Find physiological harmony - Intermittent fasting connects body, mind & soul with your weight Get inspiring and self-reflective statistics - stay motivated. DISCLAIMER Intermittent fasting is a change in eating habits. It is not suitable for pregnant/nursing women, children under 18 years of age, or people with diagnosed eating disorders. Consult your doctor or health care professional. *Individual results may vary, and testimonials are not claimed to represent typical results. HEALTH APP INTEGRATION: Fastin: Intermittent Fasting - Simple Fasting App integrates with Apple Health App so you can sync your data (requires iOS 9 and above). Fastin: Intermittent Fasting also supports Face ID for security. SUBSCRIPTION POLICY Get full access to all the features and your personalized fasting plan including a nutrition guide in the Fastin: Intermittent Fasting app with an in-app purchase. Plans: $6.99 Weekly, $19.99 Quarterly Payment: Payment will be charged to your Apple account on confirmation of purchase Cancellation: Manage at your Apple Account Settings Renewal: Account will be charged for renewal 24-hours before the end of the current period TERMS & POLICY Privacy: https://s.bongmi.cn/miscs/fasting-app/en/privacy.html Service: https://s.bongmi.cn/miscs/fasting-app/en/service.html Download Fastin: Intermittent Fasting - Simple Fasting App to help you reach your goals faster and more effectively! Establish a basic eating discipline, keep yourself in good shape during self-isolation and use our educational and motivational content to stay mindful of your eating habits. Our mission is not only to offer you an Intermittent Fasting App, but also to improve your health, increase weight loss, and improve cognitive ability. Download Intermittent Fasting Tracker now. Start your new journey today!
Kainkript
This app connects to a compatible smart scale via Bluetooth to record and track your health metrics. It provides a centralized place to view your body composition data over time.
- Bluetooth 4.0 connectivity
- Measures health data
- Tracks body composition
- Data synchronization
- View historical data
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This application works with Kainkript scale to measure your health data via Bluetooth 4.0.
Screenshots
Verdict
The clearest difference is rating: Fastin at 4.8 against Kainkript's 2.3. Fastin also leads on review sentiment (33% vs 0%) and ratings volume (10K vs 3). Kainkript's advantage is in-app purchases (none vs 12) and iOS requirement (10.0 vs 16.6). On price, update cadence, ads 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. Fastin sells 10 in-app purchases, starting at $4.49 per 7 days. Kainkript asks for nothing beyond the download.
Fastin holds the better App Store score, 4.8 against 2.3. That said, the two scores are not equally well evidenced: Fastin has 10K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 33% of Fastin's written reviews are positive against 0% of Kainkript's.
Fastin ships an update every 3 weeks, Kainkript monthly. Both last shipped on October 24, 2026.
| Parameter | Fastin | Kainkript |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (10K ratings) — better | 2.3 (3 ratings) |
| Positive reviews | 33.3% of reviews — better | 0.0% of reviews |
| Number of ratings | 10K — better | 3 |
| Update frequency | Every 3 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Subscription | Free — better |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Requires iOS | 16.6 | 10.0 — better |
| Further details — not scored | ||
| Size | 243 MB | 95 MB |
| Age rating | 17+ | 4+ |
| Developer | Bongmi Global Group | Shenzhen Careyou Health Science and Technology Co., LTD |
Customer experience
Fastin
Kainkript
Bugs and requests
Fastin
Reported bugs
4 issues- Fasting timer resets unexpectedly
- App crashes or freezes
- Sync and login issues
- Inability to edit past fasts
Requested features
6 requests- Ability to scan barcodes for nutrition info
- More recipes and meal planning options
- Integration with fitness trackers
- Customizable fasting schedules
- Better data tracking and analysis
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- Improved customer support
Kainkript
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Fastin
- FastingPrime1Weekly3 Days trial$4.497 Days
- PrimeWeekly$6.997 Days
- Fasting Prime3 Days trial$6.997 Days
Show 7 moreShow fewer
- PrimeMonthly2 variants$9.991 Month
- PrimeWeekly$9.997 Days
- Fasting Prime3 Days trial$9.991 Month
- PrimeQuarterly2 variants$19.993 Months
- Fasting Prime7 Days trial$29.991 Year
- PrimeQuarterly$29.993 Months
- PrimeYearly$49.991 Year
Kainkript
No in-app purchases









