# AAO eBooks vs COA Test Prep 2020

The clearest difference is rating: AAO eBooks at 3.8 against COA Test Prep 2020's 1.5. AAO eBooks also leads on in-app purchases (none vs 3) and review sentiment (18% vs 0%). COA Test Prep 2020's advantage is ratings volume (19 vs 5) and iOS requirement (10.1 vs 14.0). On price, ads and device support there is nothing between them.

Both are free to download. COA Test Prep 2020 sells 3 in-app purchases, starting at $4.99 per month. AAO eBooks asks for nothing beyond the download.

AAO eBooks holds the better App Store score, 3.8 against 1.5. Both are backed by a comparable volume of ratings — 5 and 19 respectively. Written reviews point the same way: 18% of AAO eBooks's written reviews are positive against 0% of COA Test Prep 2020's.

## The numbers

| Metric | AAO eBooks | COA Test Prep 2020 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (5 ratings)](https://appshunter.io/ios/app/aao-ebooks/id665817219/reviews)** | [1.5 (19 ratings)](https://appshunter.io/ios/app/coa-test-prep-2020/id1509562439/reviews) |
| Number of ratings | 5 | **19** |
| Positive reviews | **18.2% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | **Free** | Free with in-app purchases |
| Size | 78 MB | 64 MB |
| Requires iOS | 14.0 | **10.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [American Academy of Ophthalmology, Inc.](https://appshunter.io/developer/665817223) | [TRENDING MOBAPPS SRL](https://appshunter.io/developer/1526012193) |

## What reviewers say

### AAO eBooks

[App page](https://appshunter.io/ios/app/aao-ebooks/id665817219)

Access essential ophthalmology textbooks on your mobile device. Search, browse, and download purchased eBooks for offline use. Enhance learning with notes, highlights, and CME credit opportunities.

**Highlights:** Access purchased eBooks, Offline reading capability, Search and browse content, Highlighting and note-taking, Bookmark functionality, Earn CME credits

**Features:** macOS Compatibility

**In-app purchases:** none


### COA Test Prep 2020

[App page](https://appshunter.io/ios/app/coa-test-prep-2020/id1509562439)

Prepare for your COA certification exam with over 400 practice questions covering all topics. Study anytime, anywhere with this convenient mobile tool designed for busy lifestyles. Features include offline access, verified content, and lifetime free updates.

**Highlights:** Over 400 exam-style questions, Works offline, Verified content, Lifetime free updates, Test-taking strategy tips, Testing log, Friendly interface

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| COA - 14 Days Free Trial | $4.99 | per month |
| COA - 14 Days Free Trial | $19.99 | per 6 months |
| COA - Lifetime Full Access | $27.99 | one-time |


## Frequently asked questions

### Is AAO eBooks free?

AAO eBooks is free to download, with no in-app purchases.

### Is COA Test Prep 2020 free?

COA Test Prep 2020 is free to download, with in-app purchases available.

### Which has better reviews, AAO eBooks or COA Test Prep 2020?

AAO eBooks is rated higher. AAO eBooks averages 3.8 out of 5 from 5 ratings, while COA Test Prep 2020 averages 1.5 from 19 ratings.

### Do AAO eBooks or COA Test Prep 2020 have ads?

Neither AAO eBooks nor COA Test Prep 2020 shows ads.

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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.*