# Eye Chart HD vs WikEM

The clearest difference is ads: WikEM at none against Eye Chart HD's shown. WikEM also leads on update cadence (every 5 days vs every 6 months) and rating (4.8 vs 4.4). Eye Chart HD's advantage is iOS requirement (12.0 vs 15.1). On price, in-app purchases, 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 and WikEM sells 10 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

WikEM holds the better App Store score, 4.8 against 4.4. That said, the two scores are not equally well evidenced: WikEM has 4.8K ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 33% of Eye Chart HD's written reviews are positive against 54% of WikEM's.

Eye Chart HD ships an update every 6 months, WikEM every 5 days. The most recent releases landed on October 29, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Eye Chart HD | WikEM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (7 ratings)](https://appshunter.io/ios/app/eye-chart-hd/id382019572/reviews) | **[4.8 (4.8K ratings)](https://appshunter.io/ios/app/wikem/id576405449/reviews)** |
| Number of ratings | 7 | **4.8K** |
| Positive reviews | 33.3% of reviews | **54.1% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Every 5 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 31 MB | 167 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) | [OpenEM Foundation](https://appshunter.io/developer/766470023) |

## 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 |


### WikEM

[App page](https://appshunter.io/ios/app/wikem/id576405449)

This app provides a continuously updated wiki and database of emergency medicine knowledge for physicians. Access key information offline for rapid reference during daily practice. An in-app subscription unlocks advanced AI-powered questions, favorites, and history features.

**Highlights:** Emergency medicine knowledge database, Continuously updated content, Offline access, AI-powered questions (subscription), Favorites and history (subscription)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WikEM AI Search | $1.99 | per month |
| Premium Features | $4.99 | per year |
| Personal Notes | $0.99 | one-time |
| Favorites and Lists | $5.99 | one-time |
| History and Favorites | $9.99 | one-time |
| WikEM Russian Content | $29.99 | one-time |
| WikEM Italian Content | $29.99 | one-time |
| WikEM Polish Content | $29.99 | one-time |
| WikEM Hindi Content | $29.99 | one-time |
| WikEM Turkish Content | $29.99 | one-time |

**What reviewers like**

- 💡 Useful and concise information
- 🚀 Great resource for quick reference
- 👍 Helpful for medical professionals

**What reviewers complain about**

- 🐛 Frequent login and account issues
- 🐛 App crashes and database loading problems
- 🐛 Compatibility issues with newer devices
- 🔋 High battery consumption

**Reported bugs**

- Login screen freezes
- Incompatible with older devices
- Broken hyperlinks and charts
- Search function not working as expected

**Requested features**

- Dark mode support
- Ability to save favorites and customize the app
- Improved search functionality
- Regular content updates


## Frequently asked questions

### Is Eye Chart HD free?

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

### Is WikEM free?

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

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

WikEM is rated higher. Eye Chart HD averages 4.4 out of 5 from 7 ratings, while WikEM averages 4.8 from 4.8K ratings.

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

Eye Chart HD shows ads; WikEM does not.

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

Eye Chart HD ships an update every 6 months, and WikEM every 5 days. Most recently, Eye Chart HD was updated on October 29, 2026 and WikEM on November 1, 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.*