FileOpen PDF Viewer vs API Events.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FileOpen PDF Viewer
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.
- View FileOpen encrypted PDFs
- Supports Apple devices
- Simple document access
- Secure PDF viewing
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View FileOpen encrypted PDFs on your Apple device.
API Events.
Stay informed about API conferences and events. Access detailed information on agendas, speakers, and exhibitors. Connect with fellow attendees to enhance your networking experience.
- Conference agenda access
- Speaker information
- Exhibitor and sponsor details
- Attendee networking
- Event updates
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Welcome to the API Events mobile app. Stay up-to-date with all API conference and event happenings. Find everything you need to know about the program agenda, speakers, exhibitors, sponsors and network with other attendees. Available free to download for conference attendees.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | FileOpen PDF Viewer | API Events. |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 2.3 (3 ratings) — better |
| Positive reviews | 12.5% of reviews — better | 0.0% of reviews |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 10 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 11 — better | 17.0 |
| Further details — not scored | ||
| Size | 120 MB | 68 MB |
| Age rating | 4+ | 4+ |
| Developer | FileOpen Systems Inc. | American Petroleum Institute |
Customer experience
FileOpen PDF Viewer
API Events.
In-app purchases
FileOpen PDF Viewer
No in-app purchases
API Events.
No in-app purchases
