# Fastin vs Kainkript

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.

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.

## The numbers

| Metric | Fastin | Kainkript |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (10K ratings)](https://appshunter.io/ios/app/fastin-intermittent-fasting/id1526416889/reviews)** | [2.3 (3 ratings)](https://appshunter.io/ios/app/kainkript/id1612001634/reviews) |
| Number of ratings | **10K** | 3 |
| Positive reviews | **33.3% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Monetization | Subscription | **Free** |
| Size | 243 MB | 95 MB |
| Requires iOS | 16.6 | **10.0** |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Bongmi Global Group](https://appshunter.io/developer/1526416891) | [Shenzhen Careyou Health Science and Technology Co., LTD](https://appshunter.io/developer/1425765864) |

## What reviewers say

### Fastin

[App page](https://appshunter.io/ios/app/fastin-intermittent-fasting/id1526416889)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FastingPrime1Weekly | $4.49 | per 7 days |
| PrimeWeekly | $6.99 | per 7 days |
| Fasting Prime | $6.99 | per 7 days |
| PrimeMonthly | $9.99 | per month |
| PrimeWeekly | $9.99 | per 7 days |
| Fasting Prime | $9.99 | per month |
| PrimeQuarterly | $19.99 | per 3 months |
| Fasting Prime | $29.99 | per year |
| PrimeQuarterly | $29.99 | per 3 months |
| PrimeYearly | $49.99 | per year |

**What reviewers like**

- ⭐ Excellent app
- 👍 Easy to use
- 🔍 Helpful for weight loss
- 🔍 Motivational
- 🔍 Informative

**What reviewers complain about**

- 💰 Paid subscription required
- 🔍 Limited food database
- 🔍 Inaccurate calorie tracking
- 🔍 Confusing or unintuitive interface
- 🐛 Bugs and glitches

**Reported bugs**

- Fasting timer resets unexpectedly
- App crashes or freezes
- Sync and login issues
- Inability to edit past fasts

**Requested features**

- 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


### Kainkript

[App page](https://appshunter.io/ios/app/kainkript/id1612001634)

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.

**Highlights:** Bluetooth 4.0 connectivity, Measures health data, Tracks body composition, Data synchronization, View historical data

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Fastin free?

Fastin is free to download, with in-app purchases available.

### Is Kainkript free?

Kainkript is free to download, with no in-app purchases.

### Which has better reviews, Fastin or Kainkript?

Fastin is rated higher. Fastin averages 4.8 out of 5 from 10K ratings, while Kainkript averages 2.3 from 3 ratings.

### Do Fastin or Kainkript have ads?

Neither Fastin nor Kainkript shows ads.

### Which is updated more often, Fastin or Kainkript?

Fastin ships an update every 3 weeks, and Kainkript monthly. Most recently, Fastin was updated on October 24, 2026 and Kainkript on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*