# 16 vs Fastia

The clearest difference is update cadence: 16 at every 3 weeks against Fastia's every 3 months. 16 also leads on iOS requirement (14.0 vs 17). 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 Fastia sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

16 ships an update every 3 weeks, Fastia every 3 months. The most recent releases landed on October 30, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | 16 | Fastia |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Size | 86 MB | 10 MB |
| Requires iOS | **14.0** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [KAHA INNOVATION COMPANY LIMITED](https://appshunter.io/developer/1807437678) | [Maksym Zaivyi](https://appshunter.io/developer/1809719085) |

## 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 |


### Fastia

[App page](https://appshunter.io/ios/app/fastia-fasting-tracker/id6763625548)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium per month | $6.99 | per month |
| Premium for a year | $39.99 | per year |


## Frequently asked questions

### Is 16 free?

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

### Is Fastia free?

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

### Do 16 or Fastia have ads?

Neither 16 nor Fastia shows ads.

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

16 ships an update every 3 weeks, and Fastia every 3 months. Most recently, 16 was updated on October 30, 2026 and Fastia on November 9, 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.*