# Robben.App Pro vs GEOMAR Authenticator

The clearest difference is update cadence: GEOMAR Authenticator at every 3 months against Robben.App Pro's every 5 months. GEOMAR Authenticator also leads on device support (3 vs 1) and iOS requirement (13.0 vs 16.4). 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.

Robben.App Pro ships an update every 5 months, GEOMAR Authenticator every 3 months. The most recent releases landed on September 12, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Robben.App Pro | GEOMAR Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 months** |
| Size | 46 MB | 42 MB |
| Requires iOS | 16.4 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Landesbetrieb fuer Kuestenschutz, Nationalpark und Meeresschutz Schleswig-Holstein](https://appshunter.io/developer/1705383767) | [NetKnights GmbH](https://appshunter.io/developer/1445401030) |

## What reviewers say

### Robben.App Pro

[App page](https://appshunter.io/ios/app/robbenapp-pro/id6464050298)

**Features:** Vision Pro support

**In-app purchases:** none


### GEOMAR Authenticator

[App page](https://appshunter.io/ios/app/geomar-authenticator/id6476554059)

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

**In-app purchases:** none


## Frequently asked questions

### Is Robben.App Pro free?

Robben.App Pro is free to download, with no in-app purchases.

### Is GEOMAR Authenticator free?

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

### Do Robben.App Pro or GEOMAR Authenticator have ads?

Neither Robben.App Pro nor GEOMAR Authenticator shows ads.

### Which is updated more often, Robben.App Pro or GEOMAR Authenticator?

Robben.App Pro ships an update every 5 months, and GEOMAR Authenticator every 3 months. Most recently, Robben.App Pro was updated on September 12, 2026 and GEOMAR Authenticator on September 9, 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.*