# eETDRS Visual Acuity Test vs Clarity by CREST

The clearest difference is update cadence: Clarity by CREST at weekly against eETDRS Visual Acuity Test's every 3 months. eETDRS Visual Acuity Test's advantage is iOS requirement (12.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

eETDRS Visual Acuity Test ships an update every 3 months, Clarity by CREST weekly. The most recent releases landed on October 14, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | eETDRS Visual Acuity Test | Clarity by CREST |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/clarity-by-crest/id6478376629/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | — | Free |
| Size | 36 MB | 21 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Rino Enterprises LLC](https://appshunter.io/developer/406014997) | [Crest Trials Inc.](https://appshunter.io/developer/1732636966) |

## What reviewers say

### eETDRS Visual Acuity Test

[App page](https://appshunter.io/ios/app/eetdrs-visual-acuity-test/id1551492695)

**In-app purchases:** none


### Clarity by CREST

[App page](https://appshunter.io/ios/app/clarity-by-crest/id6478376629)

This platform streamlines visual acuity certification processes for medical professionals. It combines a web dashboard for management with a mobile app for field data collection, ensuring standardized training and accurate examination lane assessments.

**Highlights:** Web dashboard for managing BCVA processes, Mobile app for field data collection, Examiner Certification workflow, Lane Certification workflow, ETDRS training protocol and videos, Equipment and lane verification

**In-app purchases:** none


## Frequently asked questions

### Is eETDRS Visual Acuity Test free?

eETDRS Visual Acuity Test is free to download, with no in-app purchases.

### Is Clarity by CREST free?

Clarity by CREST is free to download, with no in-app purchases.

### Do eETDRS Visual Acuity Test or Clarity by CREST have ads?

Neither eETDRS Visual Acuity Test nor Clarity by CREST shows ads.

### Which is updated more often, eETDRS Visual Acuity Test or Clarity by CREST?

eETDRS Visual Acuity Test ships an update every 3 months, and Clarity by CREST weekly. Most recently, eETDRS Visual Acuity Test was updated on October 14, 2026 and Clarity by CREST on October 21, 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.*