# Dirnbacher vs Hydro

The clearest difference is iOS requirement: Dirnbacher at 15.6 against Hydro's 26.0. 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.

Dirnbacher ships an update every 2 months, Hydro monthly. The most recent releases landed on October 30, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Dirnbacher | Hydro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Monthly** |
| Size | 45 MB | 9 MB |
| Requires iOS | **15.6** | 26.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Idwell GmbH](https://appshunter.io/developer/1269662593) | [Patrick](https://appshunter.io/developer/385768716) |

## What reviewers say

### Dirnbacher

[App page](https://appshunter.io/ios/app/dirnbacher/id1590339107)

**In-app purchases:** none


### Hydro

[App page](https://appshunter.io/ios/app/hydro-aquatic-data-hub/id6477622181)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Dirnbacher free?

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

### Is Hydro free?

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

### Do Dirnbacher or Hydro have ads?

Neither Dirnbacher nor Hydro shows ads.

### Which is updated more often, Dirnbacher or Hydro?

Dirnbacher ships an update every 2 months, and Hydro monthly. Most recently, Dirnbacher was updated on October 30, 2026 and Hydro on November 4, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*