# Dyop® Vision Test vs Co

The clearest difference is in-app purchases: Co at none against Dyop® Vision Test's 1. Co also leads on update cadence (every 3 months vs every 7 months). Dyop® Vision Test's advantage is iOS requirement (10.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Dyop® Vision Test sells 1 in-app purchase, starting at $0.99 per month. Co asks for nothing beyond the download.

Dyop® Vision Test ships an update every 7 months, Co every 3 months. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Dyop® Vision Test | Co |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/dyop-vision-test/id1300193573/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 months** |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 30 MB |
| Requires iOS | **10.0** | 18.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 17+ |
| Developer | [Shemesh Health Solutions PTY Ltd](https://appshunter.io/developer/578849338) | [Allogy Interactive](https://appshunter.io/developer/357433598) |

## What reviewers say

### Dyop® Vision Test

[App page](https://appshunter.io/ios/app/dyop-vision-test/id1300193573)

This app allows you to test your vision quickly and accurately using your iPhone as a controller. It offers a more precise and efficient alternative to traditional eye tests, suitable for various users.

**Highlights:** iPhone controller functionality, Under 60-second vision test, Precise and consistent results, Minimizes fixation fatigue, No patient literacy required, 30-day free trial

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscriptipn | $0.99 | per month |


### Co

[App page](https://appshunter.io/ios/app/co-responder/id6756629882)

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

**In-app purchases:** none


## Frequently asked questions

### Is Dyop® Vision Test free?

Dyop® Vision Test is free to download, with in-app purchases available.

### Is Co free?

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

### Do Dyop® Vision Test or Co have ads?

Neither Dyop® Vision Test nor Co shows ads.

### Which is updated more often, Dyop® Vision Test or Co?

Dyop® Vision Test ships an update every 7 months, and Co every 3 months. Most recently, Dyop® Vision Test was updated on November 4, 2026 and Co on October 30, 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.*