# O3Z vs Wrist PDF

The clearest difference is in-app purchases: O3Z at none against Wrist PDF's 3. O3Z also leads on iOS requirement (13.0 vs 15.6). Wrist PDF's advantage is update cadence (every 11 days vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Wrist PDF sells 3 in-app purchases, starting at $3.99 per 7 days. O3Z asks for nothing beyond the download.

O3Z ships an update every 4 months, Wrist PDF every 11 days. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | O3Z | Wrist PDF |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/wrist-pdf-pdf-reader-and-viewer/id6756314530/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 11 days** |
| Monetization | — | Subscription |
| Size | 4 MB | 52 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [STEM s.r.l.](https://appshunter.io/developer/1577070000) | [Mr Siddharth](https://appshunter.io/developer/1859651378) |

## What reviewers say

### O3Z

[App page](https://appshunter.io/ios/app/o3z-tech-connect/id1609095280)

**In-app purchases:** none


### Wrist PDF

[App page](https://appshunter.io/ios/app/wrist-pdf-pdf-reader-and-viewer/id6756314530)

Access and read PDF files, documents, and notes directly from your smartwatch. Enjoy fast loading, smooth navigation, and a clean interface for on-the-go document management. Seamlessly integrates with your paired phone for quick access to essential information.

**Highlights:** View PDFs on smartwatch, Fast PDF loading, Smooth page navigation, Supports documents and notes, Clean, wrist-friendly interface, Works with paired phone

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Plan | $3.99 | per 7 days |
| Monthly plan | $9.99 | per month |
| Yearly Plan | $49.99 | per year |


## Frequently asked questions

### Is O3Z free?

O3Z is free to download, with no in-app purchases.

### Is Wrist PDF free?

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

### Do O3Z or Wrist PDF have ads?

Neither O3Z nor Wrist PDF shows ads.

### Which is updated more often, O3Z or Wrist PDF?

O3Z ships an update every 4 months, and Wrist PDF every 11 days. Most recently, O3Z was updated on October 27, 2026 and Wrist PDF 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.*