# Eye Chart HD vs CorePendium

The clearest difference is in-app purchases: CorePendium at none against Eye Chart HD's 2. CorePendium also leads on ads (none vs shown) and review sentiment (67% vs 34%). Eye Chart HD's advantage is iOS requirement (12.0 vs 15.1). On price, rating, monetization model and device support there is nothing between them.

Both are free to download. Eye Chart HD sells 2 in-app purchases, starting at $2.99 per month. CorePendium asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Eye Chart HD against 4.9 for CorePendium. That said, the two scores are not equally well evidenced: CorePendium has 1.4K ratings behind it against 5, so its average is the more settled of the two. Written reviews are what separate them: 34% of Eye Chart HD's written reviews are positive against 67% of CorePendium's.

Eye Chart HD ships an update every 6 months, CorePendium monthly. The most recent releases landed on September 29, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Eye Chart HD | CorePendium |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/eye-chart-hd/id382019572/reviews)** | [4.9 (1.4K ratings)](https://appshunter.io/ios/app/corependium/id1581291387/reviews) |
| Number of ratings | 5 | **1.4K** |
| Positive reviews | 34.5% of reviews | **66.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Monthly** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 31 MB | 49 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Dok LLC](https://appshunter.io/developer/293163442) | [EM:RAP, Inc.](https://appshunter.io/developer/804248263) |

## What reviewers say

### Eye Chart HD

[App page](https://appshunter.io/ios/app/eye-chart-hd/id382019572)

This app provides a clinically evaluated visual acuity screening tool for various settings. It offers randomized Snellen, Tumbling E, and other charts to help assess vision, especially when traditional charts are unavailable or memorized. Additional features are available through a monthly subscription.

**Highlights:** Randomized Snellen charts, Tumbling E charts, Pocket vision screener, Line randomization, Chart selector, Near vision chart (subscription), Amsler Grid (subscription)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Professional Subscription | $2.99 | per month |
| Eye Chart HD Full Version | $0.99 | one-time |


### CorePendium

[App page](https://appshunter.io/ios/app/corependium/id1581291387)

This app provides a comprehensive, continuously updated, and peer-reviewed clinical reference for Emergency and Urgent Care Medicine. It features integrated multimedia, offline access, intuitive navigation, and medical calculators, making it an essential tool for medical professionals on the go.

**Highlights:** Expert-backed, continuously revised content, Integrated media library (ECGs, X-rays, videos, audio), Offline access to all content, Intuitive navigation with Rapid Access and Deep Dive sections, Integrated medical calculators, Links to EM:RAP knowledge base content

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Great resource
- 👍 Excellent and usable app
- 👍 Terrific point of care resource
- 👍 Invaluable for EM residents

**What reviewers complain about**

- 🔍 Lacking search functionality
- 🐛 Crashes frequently
- 🔍 Poor indexing and content organization

**Reported bugs**

- Crashes on launch
- Compatibility issues with older devices

**Requested features**

- iPad version
- Ability to track progress and bookmark content
- Video playback controls (speed, rewind)


## Frequently asked questions

### Is Eye Chart HD free?

Eye Chart HD is free to download, with in-app purchases available.

### Is CorePendium free?

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

### Which has better reviews, Eye Chart HD or CorePendium?

Eye Chart HD is rated higher. Eye Chart HD averages 5.0 out of 5 from 5 ratings, while CorePendium averages 4.9 from 1.4K ratings.

### Do Eye Chart HD or CorePendium have ads?

Eye Chart HD shows ads; CorePendium does not.

### Which is updated more often, Eye Chart HD or CorePendium?

Eye Chart HD ships an update every 6 months, and CorePendium monthly. Most recently, Eye Chart HD was updated on September 29, 2026 and CorePendium on September 28, 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.*