# Eye Chart Pro vs Optonet Vision Unit

The clearest difference is in-app purchases: Optonet Vision Unit at none against Eye Chart Pro's 10. Optonet Vision Unit also leads on update cadence (every 6 weeks vs every 3 months) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Eye Chart Pro sells 10 one-off in-app purchases. Optonet Vision Unit asks for nothing beyond the download.

Eye Chart Pro ships an update every 3 months, Optonet Vision Unit every 6 weeks. The most recent releases landed on November 3, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Eye Chart Pro | Optonet Vision Unit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (3 ratings)](https://appshunter.io/ios/app/eye-chart-pro/id364802332/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 53.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 29 MB | 66 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Dok LLC](https://appshunter.io/developer/293163442) | [Optonet](https://appshunter.io/developer/475378775) |

## What reviewers say

### Eye Chart Pro

[App page](https://appshunter.io/ios/app/eye-chart-pro/id364802332)

This app provides a randomized visual acuity exam, functioning like a projector-based eye chart. It's useful for quick vision screenings, house visits, or when patients may have memorized standard charts. The app offers both Snellen and Tumbling E charts with randomization options.

**Highlights:** Randomizable Snellen Chart, Randomizable Tumbling E Chart, Randomize entire chart or line by line, Smooth interface with animations, Basic remote control, Metric / Feet functionality

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Amsler Grid in Portrait and Landscape. | $9.99 | one-time |
| Premium Home Edition of Eye Chart Pro | $19.99 | one-time |
| HOTV Chart | $19.99 | one-time |
| Sloan Letters Chart | $19.99 | one-time |
| Professional Version with ALL Features | $39.99 | one-time |
| Advanced Remote Control | $39.99 | one-time |
| All Charts | $39.99 | one-time |
| Sloan Duochrome Chart | $39.99 | one-time |
| Value Pack | $59.99 | one-time |
| Professional Package | $199.99 | one-time |


### Optonet Vision Unit

[App page](https://appshunter.io/ios/app/optonet-vision-unit/id1456179504)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Eye Chart Pro free?

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

### Is Optonet Vision Unit free?

Optonet Vision Unit is free to download, with no in-app purchases.

### Do Eye Chart Pro or Optonet Vision Unit have ads?

Neither Eye Chart Pro nor Optonet Vision Unit shows ads.

### Which is updated more often, Eye Chart Pro or Optonet Vision Unit?

Eye Chart Pro ships an update every 3 months, and Optonet Vision Unit every 6 weeks. Most recently, Eye Chart Pro was updated on November 3, 2026 and Optonet Vision Unit on November 2, 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.*