# 16 vs fast_ Intermittent Fasting

The clearest difference is update cadence: 16 at every 3 weeks against fast_ Intermittent Fasting's every 4 months. 16 also leads on iOS requirement (14.0 vs 16.4). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 16 sells 2 in-app purchases, starting at $4.99 per month and fast_ Intermittent Fasting sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

16 ships an update every 3 weeks, fast_ Intermittent Fasting every 4 months. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 16 | fast_ Intermittent Fasting |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/fast-intermittent-fasting/id6778174952/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 months |
| Monetization | — | Freemium |
| Size | 86 MB | 48 MB |
| Requires iOS | **14.0** | 16.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KAHA INNOVATION COMPANY LIMITED](https://appshunter.io/developer/1807437678) | [Atmospheric Integrity Management, LLC](https://appshunter.io/developer/6778174954) |

## What reviewers say

### 16

[App page](https://appshunter.io/ios/app/168-intermittent-fasting/id6755103248)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Trial | $4.99 | per month |
| Yearly | $19.99 | per year |


### fast_ Intermittent Fasting

[App page](https://appshunter.io/ios/app/fast-intermittent-fasting/id6778174952)

This app simplifies intermittent fasting by automatically tracking your eating windows and fast tiers. Log meals, track water intake, and monitor weight trends with a clean, customizable interface. Optional pro features offer advanced meal planning and hydration guidance.

**Highlights:** Automatic fast tracking, Clean live timer, Meal logging with calories/macros, Water intake tracking, Weight trend charting, Offline functionality, Customizable themes

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (Monthly) | $9.99 | per month |
| Pro (Annual) | $59.99 | per year |


## Frequently asked questions

### Is 16 free?

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

### Is fast_ Intermittent Fasting free?

fast_ Intermittent Fasting is free to download, with in-app purchases available.

### Do 16 or fast_ Intermittent Fasting have ads?

Neither 16 nor fast_ Intermittent Fasting shows ads.

### Which is updated more often, 16 or fast_ Intermittent Fasting?

16 ships an update every 3 weeks, and fast_ Intermittent Fasting every 4 months. Most recently, 16 was updated on October 30, 2026 and fast_ Intermittent Fasting on October 31, 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.*