# zWatch vs 16

The clearest difference is in-app purchases: zWatch at none against 16's 2. zWatch also leads on iOS requirement (9.0 vs 14.0). 16's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads 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. zWatch asks for nothing beyond the download.

zWatch ships an update every 2 months, 16 every 3 weeks. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | zWatch | 16 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/zwatch/id1509879901/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 113 MB | 86 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Zadez Vietnam Company Limited](https://appshunter.io/developer/1259057705) | [KAHA INNOVATION COMPANY LIMITED](https://appshunter.io/developer/1807437678) |

## What reviewers say

### zWatch

[App page](https://appshunter.io/ios/app/zwatch/id1509879901)

This app tracks your daily activity, sleep patterns, and exercise, providing insights to encourage a healthy lifestyle. It requires a ZADEZ Smart Watch to function and offers customization options for your device.

**Highlights:** Accurate motion recording, Detailed sleeping analysis, Exercise tracking, Set notifications, Customize watch faces, Alarm settings, Apple Health integration

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is zWatch free?

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

### Is 16 free?

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

### Do zWatch or 16 have ads?

Neither zWatch nor 16 shows ads.

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

zWatch ships an update every 2 months, and 16 every 3 weeks. Most recently, zWatch was updated on November 3, 2026 and 16 on October 30, 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.*