# Horizon by flexlog vs Robben.App

The clearest difference is iOS requirement: Robben.App at 16.4 against Horizon by flexlog's 26.1. On price, update cadence, 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.

Both ship on a similar rhythm, roughly every 6 months. The most recent releases landed on September 12, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Horizon by flexlog | Robben.App |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | Every 6 months |
| Size | 1 MB | 51 MB |
| Requires iOS | 26.1 | **16.4** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [flexlog](https://appshunter.io/developer/1553084096) | [Landesbetrieb fuer Kuestenschutz, Nationalpark und Meeresschutz Schleswig-Holstein](https://appshunter.io/developer/1705383767) |

## What reviewers say

### Horizon by flexlog

[App page](https://appshunter.io/ios/app/horizon-by-flexlog/id1553084094)

**In-app purchases:** none


### Robben.App

[App page](https://appshunter.io/ios/app/robbenapp/id6464050244)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Horizon by flexlog free?

Horizon by flexlog is free to download, with no in-app purchases.

### Is Robben.App free?

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

### Do Horizon by flexlog or Robben.App have ads?

Neither Horizon by flexlog nor Robben.App shows ads.

### Which is updated more often, Horizon by flexlog or Robben.App?

Horizon by flexlog ships an update every 6 months, and Robben.App every 6 months. Most recently, Horizon by flexlog was updated on September 12, 2026 and Robben.App on September 19, 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.*