# API 570 Highlights Practices vs FileOpen PDF Viewer

The clearest difference is rating: API 570 Highlights Practices at 5.0 against FileOpen PDF Viewer's 1.0. API 570 Highlights Practices also leads on update cadence (every 2 months vs every 10 months) and iOS requirement (9.1 vs 11). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

API 570 Highlights Practices holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

API 570 Highlights Practices ships an update every 2 months, FileOpen PDF Viewer every 10 months. The most recent releases landed on September 29, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | API 570 Highlights Practices | FileOpen PDF Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/api-570-highlights-practices/id1343650992/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/fileopen-pdf-viewer/id1645208749/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | — | 12.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 10 months |
| Monetization | Free | Free |
| Size | 16 MB | 120 MB |
| Requires iOS | **9.1** | 11 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nguyen Hieu](https://appshunter.io/developer/1323491316) | [FileOpen Systems Inc.](https://appshunter.io/developer/520287058) |

## What reviewers say

### API 570 Highlights Practices

[App page](https://appshunter.io/ios/app/api-570-highlights-practices/id1343650992)

This free version offers a glimpse into piping inspection practices and exam questions. The full version provides over 1000 questions covering all sections of the API 570 Test.

**Highlights:** Practice questions, Exam simulations, Covers API 570 test sections, Free version available, Full version with 1000+ questions

**Features:** macOS Compatibility

**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 API 570 Highlights Practices free?

API 570 Highlights Practices 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, API 570 Highlights Practices or FileOpen PDF Viewer?

API 570 Highlights Practices is rated higher. API 570 Highlights Practices averages 5.0 out of 5 from 1 ratings, while FileOpen PDF Viewer averages 1.0 from 1 ratings.

### Do API 570 Highlights Practices or FileOpen PDF Viewer have ads?

Neither API 570 Highlights Practices nor FileOpen PDF Viewer shows ads.

### Which is updated more often, API 570 Highlights Practices or FileOpen PDF Viewer?

API 570 Highlights Practices ships an update every 2 months, and FileOpen PDF Viewer every 10 months. Most recently, API 570 Highlights Practices was updated on September 29, 2026 and FileOpen PDF Viewer on September 17, 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.*