# iCorrTool vs Retinal

The clearest difference is update cadence: Retinal at fortnightly against iCorrTool's every 3 months. iCorrTool's advantage is device support (3 vs 1) and iOS requirement (13 vs 17.0). On price, 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.

iCorrTool ships an update every 3 months, Retinal fortnightly. The most recent releases landed on September 9, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | iCorrTool | Retinal |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Size | 48 MB | 1 MB |
| Requires iOS | **13** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Steffel KKS GmbH](https://appshunter.io/developer/786166712) | [Nico Rohrbach](https://appshunter.io/developer/662717596) |

## What reviewers say

### iCorrTool

[App page](https://appshunter.io/ios/app/icorrtool/id786166709)

**Features:** macOS Compatibility

**In-app purchases:** none


### Retinal

[App page](https://appshunter.io/ios/app/retinal/id1564557619)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iCorrTool free?

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

### Is Retinal free?

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

### Do iCorrTool or Retinal have ads?

Neither iCorrTool nor Retinal shows ads.

### Which is updated more often, iCorrTool or Retinal?

iCorrTool ships an update every 3 months, and Retinal fortnightly. Most recently, iCorrTool was updated on September 9, 2026 and Retinal on September 8, 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.*