# 3D PDF Viewer vs FileOpen PDF Viewer

The clearest difference is rating: 3D PDF Viewer at 1.5 against FileOpen PDF Viewer's 1.0. FileOpen PDF Viewer's advantage is review sentiment (13% vs 0%) and iOS requirement (11 vs 15.6). On price, ratings volume, update cadence and ads there is nothing between them.

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

3D PDF Viewer holds the better App Store score, 1.5 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews complicate that: 0% of 3D PDF Viewer's written reviews are positive against 13% of FileOpen PDF Viewer's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 10 months. Both last shipped on June 4, 2026.

## The numbers

| Metric | 3D PDF Viewer | FileOpen PDF Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.5 (2 ratings)](https://appshunter.io/ios/app/3d-pdf-viewer/id919857557/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/fileopen-pdf-viewer/id1645208749/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 0.0% of reviews | **12.5% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | Every 10 months |
| Monetization | Free | Free |
| Size | 21 MB | 120 MB |
| Requires iOS | 15.6 | **11** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ProtoTech Solutions and Services Pvt. Ltd.](https://appshunter.io/developer/365252924) | [FileOpen Systems Inc.](https://appshunter.io/developer/520287058) |

## What reviewers say

### 3D PDF Viewer

[App page](https://appshunter.io/ios/app/3d-pdf-viewer/id919857557)

View and interact with 3D models embedded in PDF files on your mobile device. Easily zoom, pan, and rotate models using intuitive multi-touch gestures. Load files directly from cloud storage services like Dropbox and Google Drive.

**Highlights:** 3D PDF model rendering (.prc), Multi-touch gestures (zoom, pan, rotate), Import from cloud storage, Open password-protected PDFs, Integrated Box and Dropbox browsing, Supports meshes and colors

**In-app purchases:** none


### FileOpen PDF Viewer

[App page](https://appshunter.io/ios/app/fileopen-pdf-viewer/id1645208749)

This application allows users to view PDFs that have been encrypted using FileOpen technology on their Apple devices. It provides a straightforward way to access secure documents on iPhones and iPads.

**Highlights:** View FileOpen encrypted PDFs, Supports Apple devices, Simple document access, Secure PDF viewing

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 3D PDF Viewer free?

3D PDF Viewer is free to download, with no in-app purchases.

### Is FileOpen PDF Viewer free?

FileOpen PDF Viewer is free to download, with no in-app purchases.

### Which has better reviews, 3D PDF Viewer or FileOpen PDF Viewer?

3D PDF Viewer is rated higher. 3D PDF Viewer averages 1.5 out of 5 from 2 ratings, while FileOpen PDF Viewer averages 1.0 from 1 ratings.

### Do 3D PDF Viewer or FileOpen PDF Viewer have ads?

Neither 3D PDF Viewer nor FileOpen PDF Viewer shows ads.

### Which is updated more often, 3D PDF Viewer or FileOpen PDF Viewer?

3D PDF Viewer ships an update every 10 months, and FileOpen PDF Viewer every 10 months. Most recently, 3D PDF Viewer was updated on June 4, 2026 and FileOpen PDF Viewer on June 4, 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.*