# iTorsion vs IOL Reference

The clearest difference is update cadence: IOL Reference at weekly against iTorsion's every 3 months. iTorsion's advantage is rating (5.0 vs 4.7) and review sentiment (100% vs 89%). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

iTorsion holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 6 and 15 respectively. Written reviews point the same way: 100% of iTorsion's written reviews are positive against 89% of IOL Reference's.

iTorsion ships an update every 3 months, IOL Reference weekly. The most recent releases landed on September 23, 2026 and July 5, 2026 respectively.

## The numbers

| Metric | iTorsion | IOL Reference |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/itorsion/id1358552637/reviews)** | [4.7 (15 ratings)](https://appshunter.io/ios/app/iol-reference/id1626671895/reviews) |
| Number of ratings | 6 | **15** |
| Positive reviews | **100.0% of reviews** | 88.9% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | Free | Free |
| Size | 17 MB | 823 MB |
| Requires iOS | **10.3** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Regents of the University of Minnesota](https://appshunter.io/developer/455216626) | [Gurpal Virdi](https://appshunter.io/developer/1626671897) |

## What reviewers say

### iTorsion

[App page](https://appshunter.io/ios/app/itorsion/id1358552637)

This medical app simplifies diagnosing ocular torsion using just a smartphone and red/green glasses. It offers greater precision than traditional methods, providing extorsion and intorsion measurements for each eye after a patient test.

**Highlights:** Ocular torsion diagnosis, Smartphone-based testing, Red/green glasses compatibility, Precise measurement, Extorsion and intorsion calculation, Customizable color values

**Features:** macOS Compatibility

**In-app purchases:** none


### IOL Reference

[App page](https://appshunter.io/ios/app/iol-reference/id1626671895)

This ophthalmology utility helps surgeons find FDA-approved intraocular lenses. It features a searchable database of nearly 10,000 lenses, updated with new approvals and changes. The app also serves as a social media and networking platform for eye care professionals.

**Highlights:** Searchable IOL database, FDA-approved lens catalog, Database updates, Ophthalmology networking, Eye care tools

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

**In-app purchases:** none


## Frequently asked questions

### Is iTorsion free?

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

### Is IOL Reference free?

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

### Which has better reviews, iTorsion or IOL Reference?

iTorsion is rated higher. iTorsion averages 5.0 out of 5 from 6 ratings, while IOL Reference averages 4.7 from 15 ratings.

### Do iTorsion or IOL Reference have ads?

Neither iTorsion nor IOL Reference shows ads.

### Which is updated more often, iTorsion or IOL Reference?

iTorsion ships an update every 3 months, and IOL Reference weekly. Most recently, iTorsion was updated on September 23, 2026 and IOL Reference on July 5, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*