# RettApp vs OSLab

The clearest difference is update cadence: OSLab at every 3 months against RettApp's every 6 months. 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.

RettApp ships an update every 6 months, OSLab every 3 months. The most recent releases landed on September 6, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | RettApp | OSLab |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 months** |
| Size | 44 MB | 100 MB |
| Requires iOS | 11.0 | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Aljoscha Otten](https://appshunter.io/developer/1742144969) | [itech Laborloesungen GmbH](https://appshunter.io/developer/1411361216) |

## What reviewers say

### RettApp

[App page](https://appshunter.io/ios/app/rettapp-ev/id1031171079)

**Features:** macOS Compatibility

**In-app purchases:** none


### OSLab

[App page](https://appshunter.io/ios/app/oslab/id1552737435)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is RettApp free?

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

### Is OSLab free?

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

### Do RettApp or OSLab have ads?

Neither RettApp nor OSLab shows ads.

### Which is updated more often, RettApp or OSLab?

RettApp ships an update every 6 months, and OSLab every 3 months. Most recently, RettApp was updated on September 6, 2026 and OSLab on September 22, 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.*