# Ristoo(客户) vs PDF Watch Viewer

The clearest difference is in-app purchases: Ristoo(客户) at none against PDF Watch Viewer's 5. Ristoo(客户) also leads on iOS requirement (10.0 vs 26.0). PDF Watch Viewer's advantage is update cadence (every 5 days vs every 8 months). On price, ads and device support there is nothing between them.

Both are free to download. PDF Watch Viewer sells 5 in-app purchases, starting at $4.99 per 7 days. Ristoo(客户) asks for nothing beyond the download.

Ristoo(客户) ships an update every 8 months, PDF Watch Viewer every 5 days. The most recent releases landed on October 18, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Ristoo(客户) | PDF Watch Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/pdf-watch-viewer-reader/id6760616296/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 5 days** |
| Monetization | — | Free with in-app purchases |
| Size | 2 MB | 20 MB |
| Requires iOS | **10.0** | 26.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [QIANLE HUANG](https://appshunter.io/developer/1482035040) | [Muhammed Deniz](https://appshunter.io/developer/1653314831) |

## What reviewers say

### Ristoo(客户)

[App page](https://appshunter.io/ios/app/ristoo/id1522925747)

**Features:** macOS Compatibility

**In-app purchases:** none


### PDF Watch Viewer

[App page](https://appshunter.io/ios/app/pdf-watch-viewer-reader/id6760616296)

Transform your Apple Watch into a portable file viewer. Access and read PDFs, photos, and documents directly on your wrist, even without your phone. Enjoy fast transfers and a clean interface for on-the-go convenience.

**Highlights:** View PDFs on Apple Watch, Browse photos and images on wrist, Supports PDF, images, and documents, Fast file transfer from iPhone, Clean and minimal interface, Offline file access

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $4.99 | per 7 days |
| Yearly Discounted | $14.99 | per year |
| Yearly Premium | $19.99 | per year |
| Yearly Premium | $19.99 | per year |
| Premium | $24.99 | per year |


## Frequently asked questions

### Is Ristoo(客户) free?

Ristoo(客户) is free to download, with no in-app purchases.

### Is PDF Watch Viewer free?

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

### Do Ristoo(客户) or PDF Watch Viewer have ads?

Neither Ristoo(客户) nor PDF Watch Viewer shows ads.

### Which is updated more often, Ristoo(客户) or PDF Watch Viewer?

Ristoo(客户) ships an update every 8 months, and PDF Watch Viewer every 5 days. Most recently, Ristoo(客户) was updated on October 18, 2026 and PDF Watch Viewer on October 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.*