# COE Prep vs ABO

The clearest difference is review sentiment: COE Prep at 76% against ABO's 25%. COE Prep also leads on rating (4.8 vs 3.4) and ads (none vs shown). ABO's advantage is in-app purchases (none vs 1). On price and device support there is nothing between them.

Both are free to download. COE Prep sells 1 one-off in-app purchase. ABO asks for nothing beyond the download.

COE Prep holds the better App Store score, 4.8 against 3.4. That said, the two scores are not equally well evidenced: COE Prep has 78 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 76% of COE Prep's written reviews are positive against 25% of ABO's.

COE Prep ships an update every 3 weeks, ABO every 3 months. The most recent releases landed on September 19, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | COE Prep | ABO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (78 ratings)](https://appshunter.io/ios/app/coe-prep/id315534299/reviews)** | [3.4 (5 ratings)](https://appshunter.io/ios/app/abo-ncle-certifications/id6741852627/reviews) |
| Number of ratings | **78** | 5 |
| Positive reviews | **76.2% of reviews** | 25.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 121 MB | 51 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Higher Learning Technologies](https://appshunter.io/developer/571804544) | [American Board of Opticianry & National Contact Lens Examiners](https://appshunter.io/developer/1795904773) |

## What reviewers say

### COE Prep

[App page](https://appshunter.io/ios/app/coe-prep/id315534299)

Prepare for your Certified Ophthalmic Executive exam with official flashcards. This app offers over 300 practice questions covering key areas of ophthalmic administration, with detailed explanations and progress tracking. Study efficiently anytime, anywhere.

**Highlights:** 300+ exam-like practice questions, Detailed explanations for answers, Covers 6 key exam categories, Tag questions for quick review, Immediate progress feedback, Study anytime, anywhere

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| COE Exam Prep | $99.99 | one-time |


### ABO

[App page](https://appshunter.io/ios/app/abo-ncle-certifications/id6741852627)

Stay updated with your opticianry certifications and renewals. Access important documents, manage your digital wallet card with QR code, and register for exams. This app keeps you informed about news and events in the opticianry field.

**Highlights:** News Feed, Event Calendar, Digital Wallet Card with QR code, Certification Hub access, Certification Renewals, Exam Registration

**In-app purchases:** none


## Frequently asked questions

### Is COE Prep free?

COE Prep is free to download, with in-app purchases available.

### Is ABO free?

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

### Which has better reviews, COE Prep or ABO?

COE Prep is rated higher. COE Prep averages 4.8 out of 5 from 78 ratings, while ABO averages 3.4 from 5 ratings.

### Do COE Prep or ABO have ads?

ABO shows ads; COE Prep does not.

### Which is updated more often, COE Prep or ABO?

COE Prep ships an update every 3 weeks, and ABO every 3 months. Most recently, COE Prep was updated on September 19, 2026 and ABO on September 4, 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.*