# Fasty vs 16

The clearest difference is in-app purchases: Fasty at none against 16's 3. Fasty also leads on review sentiment (100% vs 78%). 16's advantage is update cadence (every 9 days vs every 16 months) and ratings volume (54 vs 7). On price, rating, ads and device support there is nothing between them.

Both are free to download. 16 sells 3 in-app purchases, starting at $1.99 per month. Fasty asks for nothing beyond the download.

Fasty holds the better App Store score, 4.9 against 4.7. That said, the two scores are not equally well evidenced: 16 has 54 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 100% of Fasty's written reviews are positive against 78% of 16's.

Fasty ships an update every 16 months, 16 every 9 days. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Fasty | 16 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (7 ratings)](https://appshunter.io/ios/app/fasty-fasting-tracker/id1596329455/reviews)** | [4.7 (54 ratings)](https://appshunter.io/ios/app/168-intermittent-fasting/id6708227128/reviews) |
| Number of ratings | 7 | **54** |
| Positive reviews | **100.0% of reviews** | 77.8% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 9 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 2 MB | 6 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Forest and the Trees, LLC](https://appshunter.io/developer/1596329457) | [Heze Refresh Network Technology Co., Ltd](https://appshunter.io/developer/1690178793) |

## What reviewers say

### Fasty

[App page](https://appshunter.io/ios/app/fasty-fasting-tracker/id1596329455)

This app helps users track intermittent fasting by monitoring fasting days and eating periods. It supports weight tracking in both pounds and kilograms and does not collect user data.

**Highlights:** Intermittent fasting tracking, Weight tracking, Fasting day monitoring, Eating period logging, Pound and kilogram support, No data collection

**In-app purchases:** none


### 16

[App page](https://appshunter.io/ios/app/168-intermittent-fasting/id6708227128)

This app helps users adopt intermittent fasting by tracking fasting periods, weight changes, and daily water intake. It integrates with Apple Health to import exercise data, providing insights into daily activity alongside dietary progress.

**Highlights:** Fasting tracking, Weight tracking, Water intake tracking, HealthKit integration, Fasting progress visualization

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (Monthly) | $1.99 | per month |
| Pro (Yearly) | $8.99 | per year |
| Pro (Lifetime) | $17.99 | one-time |


## Frequently asked questions

### Is Fasty free?

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

### Is 16 free?

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

### Which has better reviews, Fasty or 16?

Fasty is rated higher. Fasty averages 4.9 out of 5 from 7 ratings, while 16 averages 4.7 from 54 ratings.

### Do Fasty or 16 have ads?

Neither Fasty nor 16 shows ads.

### Which is updated more often, Fasty or 16?

Fasty ships an update every 16 months, and 16 every 9 days. Most recently, Fasty was updated on November 3, 2026 and 16 on November 4, 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.*