# GBO mobile vs RSA21.app

The clearest difference is update cadence: RSA21.app at weekly against GBO mobile's every 8 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.

GBO mobile ships an update every 8 months, RSA21.app weekly. The most recent releases landed on October 27, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | GBO mobile | RSA21.app |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Weekly** |
| Size | 49 MB | 29 MB |
| Requires iOS | 15.5 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [neusta mobile solutions GmbH](https://appshunter.io/developer/387164587) | [KMS Gruppe](https://appshunter.io/developer/6810972514) |

## What reviewers say

### GBO mobile

[App page](https://appshunter.io/ios/app/gbo-mobile/id1541160836)

**In-app purchases:** none


### RSA21.app

[App page](https://appshunter.io/ios/app/rsa21app/id6810972512)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GBO mobile free?

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

### Is RSA21.app free?

RSA21.app is free to download, with no in-app purchases.

### Do GBO mobile or RSA21.app have ads?

Neither GBO mobile nor RSA21.app shows ads.

### Which is updated more often, GBO mobile or RSA21.app?

GBO mobile ships an update every 8 months, and RSA21.app weekly. Most recently, GBO mobile was updated on October 27, 2026 and RSA21.app on October 26, 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.*