# FileOpen PDF Viewer vs API Events.

The clearest difference is rating: API Events. at 2.3 against FileOpen PDF Viewer's 1.0. API Events. also leads on update cadence (every 2 months vs every 10 months) and ratings volume (3 vs 1). FileOpen PDF Viewer's advantage is review sentiment (13% vs 0%) and iOS requirement (11 vs 17.0). 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.

API Events. holds the better App Store score, 2.3 against 1.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews complicate that: 13% of FileOpen PDF Viewer's written reviews are positive against 0% of API Events.'s, so the app with the better star average is not the one people write more warmly about.

FileOpen PDF Viewer ships an update every 10 months, API Events. every 2 months. The most recent releases landed on June 4, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | FileOpen PDF Viewer | API Events. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/fileopen-pdf-viewer/id1645208749/reviews) | **[2.3 (3 ratings)](https://appshunter.io/ios/app/api-events/id1669617172/reviews)** |
| Number of ratings | 1 | **3** |
| Positive reviews | **12.5% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 120 MB | 68 MB |
| Requires iOS | **11** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [FileOpen Systems Inc.](https://appshunter.io/developer/520287058) | [American Petroleum Institute](https://appshunter.io/developer/884118795) |

## What reviewers say

### 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


### API Events.

[App page](https://appshunter.io/ios/app/api-events/id1669617172)

Stay informed about API conferences and events. Access detailed information on agendas, speakers, and exhibitors. Connect with fellow attendees to enhance your networking experience.

**Highlights:** Conference agenda access, Speaker information, Exhibitor and sponsor details, Attendee networking, Event updates

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is FileOpen PDF Viewer free?

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

### Is API Events. free?

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

### Which has better reviews, FileOpen PDF Viewer or API Events.?

API Events. is rated higher. FileOpen PDF Viewer averages 1.0 out of 5 from 1 ratings, while API Events. averages 2.3 from 3 ratings.

### Do FileOpen PDF Viewer or API Events. have ads?

Neither FileOpen PDF Viewer nor API Events. shows ads.

### Which is updated more often, FileOpen PDF Viewer or API Events.?

FileOpen PDF Viewer ships an update every 10 months, and API Events. every 2 months. Most recently, FileOpen PDF Viewer was updated on June 4, 2026 and API Events. on September 10, 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.*