# Goniotrans vs VisionC (ETDRS Visual Acuity)

The clearest difference is price: Goniotrans at Free against VisionC (ETDRS Visual Acuity)'s $79.99. Goniotrans also leads on device support (3 vs 1). VisionC (ETDRS Visual Acuity)'s advantage is update cadence (every 8 months vs every 39 months) and iOS requirement (10.0 vs 12.0). On ads and in-app purchases there is nothing between them.

Goniotrans is free to download; VisionC (ETDRS Visual Acuity) costs $79.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Goniotrans ships an update every 39 months, VisionC (ETDRS Visual Acuity) every 8 months. The most recent releases landed on September 22, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Goniotrans | VisionC (ETDRS Visual Acuity) |
| --- | --- | --- |
| Price | **Free** | $79.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/goniotrans/id595634397/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 8 months** |
| Monetization | Free | — |
| Size | 3 MB | 9 MB |
| Requires iOS | 12.0 | **10.0** |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Felipe Gordillo](https://appshunter.io/developer/595634400) | [Qvision, Departamento de Oftalmología](https://appshunter.io/developer/1602553646) |

## What reviewers say

### Goniotrans

[App page](https://appshunter.io/ios/app/goniotrans/id595634397)

This medical tool helps visualize and measure angular positions of ocular structures on eye images. It overlays a protractor template to accurately mark reference points for surgical incisions or lens placement. Useful for ophthalmologists and eye care professionals.

**Highlights:** Angular measurement on eye images, Overlay protractor template, Mark reference points, Measure incision meridians, Assess lens stability

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

**In-app purchases:** none


### VisionC (ETDRS Visual Acuity)

[App page](https://appshunter.io/ios/app/visionc-etdrs-visual-acuity/id1041393885)

**In-app purchases:** none


## Frequently asked questions

### Is Goniotrans free?

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

### Is VisionC (ETDRS Visual Acuity) free?

VisionC (ETDRS Visual Acuity) costs $79.99, with no in-app purchases.

### Do Goniotrans or VisionC (ETDRS Visual Acuity) have ads?

Neither Goniotrans nor VisionC (ETDRS Visual Acuity) shows ads.

### Which is updated more often, Goniotrans or VisionC (ETDRS Visual Acuity)?

Goniotrans ships an update every 39 months, and VisionC (ETDRS Visual Acuity) every 8 months. Most recently, Goniotrans was updated on September 22, 2026 and VisionC (ETDRS Visual Acuity) on September 26, 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.*