# ISC2 Official Exam Prep vs OnSecure eBook Reader

The clearest difference is rating: ISC2 Official Exam Prep at 4.4 against OnSecure eBook Reader's 1.0. ISC2 Official Exam Prep also leads on ratings volume (407 vs 1) and update cadence (fortnightly vs every 2 months). OnSecure eBook Reader's advantage is in-app purchases (none vs 5) and iOS requirement (11.0 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. ISC2 Official Exam Prep sells 5 in-app purchases, starting at $4.99 per 7 days. OnSecure eBook Reader asks for nothing beyond the download.

ISC2 Official Exam Prep holds the better App Store score, 4.4 against 1.0. That said, the two scores are not equally well evidenced: ISC2 Official Exam Prep has 407 ratings behind it against 1, so its average is the more settled of the two.

ISC2 Official Exam Prep ships an update fortnightly, OnSecure eBook Reader every 2 months. The most recent releases landed on September 22, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | ISC2 Official Exam Prep | OnSecure eBook Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (407 ratings)](https://appshunter.io/ios/app/isc2-official-exam-prep/id1555533017/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/onsecure-ebook-reader/id6453166683/reviews) |
| Number of ratings | **407** | 1 |
| Positive reviews | 69.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 87 MB | 108 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [learnZapp](https://appshunter.io/developer/435622455) | [OnFulfillment Inc.](https://appshunter.io/developer/1699207607) |

## What reviewers say

### ISC2 Official Exam Prep

[App page](https://appshunter.io/ios/app/isc2-official-exam-prep/id1555533017)

Prepare for CISSP, CCSP, and SSCP certification exams with official study materials. Access thousands of questions, flashcards, and glossary terms. Track your progress and build custom practice tests to identify and improve weak areas.

**Highlights:** Thousands of exam-specific questions, Detailed explanations, Flashcards and glossary, Readiness score, Custom test builder, Progress tracker, Mock exams

**Features:** Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All Access - 1 Week | $4.99 | per 7 days |
| All Access - 1 Month | $16.99 | per month |
| All Access - 3 Months | $44.99 | per 3 months |
| All Access - 6 Months | $79.99 | per 6 months |
| All Access - 1 Year | $139.99 | per year |


### OnSecure eBook Reader

[App page](https://appshunter.io/ios/app/onsecure-ebook-reader/id6453166683)

This application offers an interactive eBook reading experience with a fresh design. It integrates books with videos, audio, images, and interactive elements to enhance learning and engagement.

**Highlights:** Interactive eBook reader, Integrated videos and audio, Image banks, Synched audio, Book download capabilities, Engaging learning experience

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ISC2 Official Exam Prep free?

ISC2 Official Exam Prep is free to download, with in-app purchases available.

### Is OnSecure eBook Reader free?

OnSecure eBook Reader is free to download, with no in-app purchases.

### Which has better reviews, ISC2 Official Exam Prep or OnSecure eBook Reader?

ISC2 Official Exam Prep is rated higher. ISC2 Official Exam Prep averages 4.4 out of 5 from 407 ratings, while OnSecure eBook Reader averages 1.0 from 1 ratings.

### Do ISC2 Official Exam Prep or OnSecure eBook Reader have ads?

Neither ISC2 Official Exam Prep nor OnSecure eBook Reader shows ads.

### Which is updated more often, ISC2 Official Exam Prep or OnSecure eBook Reader?

ISC2 Official Exam Prep ships an update fortnightly, and OnSecure eBook Reader every 2 months. Most recently, ISC2 Official Exam Prep was updated on September 22, 2026 and OnSecure eBook Reader on June 5, 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.*