# Cataract Logbook vs Refractive Foundations

The clearest difference is iOS requirement: Refractive Foundations at 16.6 against Cataract Logbook's 18.5. 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.

## The numbers

| Metric | Cataract Logbook | Refractive Foundations |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Daily |
| Size | 3 MB | 19 MB |
| Requires iOS | 18.5 | **16.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Jonathan Lake](https://appshunter.io/developer/1825916761) | [Gurpal Virdi](https://appshunter.io/developer/1626671897) |

## What reviewers say

### Cataract Logbook

[App page](https://appshunter.io/ios/app/cataract-logbook/id6748470940)

**Features:** macOS Compatibility

**In-app purchases:** none


### Refractive Foundations

[App page](https://appshunter.io/ios/app/refractive-foundations/id6749237006)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Cataract Logbook free?

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

### Is Refractive Foundations free?

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

### Do Cataract Logbook or Refractive Foundations have ads?

Neither Cataract Logbook nor Refractive Foundations shows ads.

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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.*