# Hydro vs GeoWater

The clearest difference is update cadence: Hydro at monthly against GeoWater's every 5 months. GeoWater's advantage is iOS requirement (16.6 vs 26.0). 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.

Hydro ships an update monthly, GeoWater every 5 months. The most recent releases landed on September 22, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Hydro | GeoWater |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 5 months |
| Size | 7 MB | 29 MB |
| Requires iOS | 26.0 | **16.6** |
| Devices | iPhone, Apple Watch | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Patrick](https://appshunter.io/developer/385768716) | [VASSAR LABS INC](https://appshunter.io/developer/1495797102) |

## What reviewers say

### 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


### GeoWater

[App page](https://appshunter.io/ios/app/geowater/id6746334591)

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

**In-app purchases:** none


## Frequently asked questions

### Is Hydro free?

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

### Is GeoWater free?

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

### Do Hydro or GeoWater have ads?

Neither Hydro nor GeoWater shows ads.

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

Hydro ships an update monthly, and GeoWater every 5 months. Most recently, Hydro was updated on September 22, 2026 and GeoWater on September 13, 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.*