# Locklizard Safeguard Viewer vs Unshared PDF Reader

The clearest difference is update cadence: Unshared PDF Reader at every 3 days against Locklizard Safeguard Viewer's every 2 months. Unshared PDF Reader also leads on iOS requirement (13.0 vs 15.6). Locklizard Safeguard Viewer's advantage is review sentiment (11% vs 0%). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Locklizard Safeguard Viewer ships an update every 2 months, Unshared PDF Reader every 3 days. The most recent releases landed on October 8, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Locklizard Safeguard Viewer | Unshared PDF Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.8 (8 ratings)](https://appshunter.io/ios/app/locklizard-safeguard-viewer/id627385747/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | **10.8% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | Free | Free |
| Size | 74 MB | 1 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [LockLizard](https://appshunter.io/developer/627385830) | [迪 吴](https://appshunter.io/developer/895299436) |

## What reviewers say

### Locklizard Safeguard Viewer

[App page](https://appshunter.io/ios/app/locklizard-safeguard-viewer/id627385747)

This free application allows users to view protected PDF documents on their iOS devices. It supports secure PDF files that have been protected using specific DRM security software.

**Highlights:** View secure PDF documents, Supports PDC files, DRM protected PDF viewing, iOS compatibility, Free to use

**Features:** macOS Compatibility

**In-app purchases:** none


### Unshared PDF Reader

[App page](https://appshunter.io/ios/app/unshared-pdf-reader/id1543661709)

This free document reader allows you to easily open and view authorized PDF and .updf files. It is specifically designed for documents created by the PDF Unshare program.

**Highlights:** View PDF files, View .updf files, Supports authorized documents, Free to use, Designed for PDF Unshare program

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Locklizard Safeguard Viewer free?

Locklizard Safeguard Viewer is free to download, with no in-app purchases.

### Is Unshared PDF Reader free?

Unshared PDF Reader is free to download, with no in-app purchases.

### Do Locklizard Safeguard Viewer or Unshared PDF Reader have ads?

Neither Locklizard Safeguard Viewer nor Unshared PDF Reader shows ads.

### Which is updated more often, Locklizard Safeguard Viewer or Unshared PDF Reader?

Locklizard Safeguard Viewer ships an update every 2 months, and Unshared PDF Reader every 3 days. Most recently, Locklizard Safeguard Viewer was updated on October 8, 2026 and Unshared PDF Reader on October 1, 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.*