# Hydrology Formulator vs GEO5 Data Collector

The clearest difference is in-app purchases: GEO5 Data Collector at none against Hydrology Formulator's 1. GEO5 Data Collector also leads on update cadence (every 3 months vs every 6 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Hydrology Formulator sells 1 one-off in-app purchase. GEO5 Data Collector asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Hydrology Formulator against 5.0 for GEO5 Data Collector. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Hydrology Formulator ships an update every 6 months, GEO5 Data Collector every 3 months. The most recent releases landed on November 10, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Hydrology Formulator | GEO5 Data Collector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/hydrology-formulator/id346512904/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/geo5-data-collector/id6446826835/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 months** |
| Monetization | Free | Free |
| Size | 18 MB | 52 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [FINE spol. s r.o.](https://appshunter.io/developer/1679287610) |

## What reviewers say

### Hydrology Formulator

[App page](https://appshunter.io/ios/app/hydrology-formulator/id346512904)

This app provides a comprehensive collection of over 1,000 formulas, calculators, and conversions for hydrology and civil engineering. It covers a wide range of topics including groundwater, stormwater, pipe flow, and water pollution.

**Highlights:** 1,000+ formulas and calculators, Groundwater analysis tools, Stormwater design calculations, Open channel and pipe flow equations, Water pollution modeling, Conversions and reference data

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $3.99 | one-time |


### GEO5 Data Collector

[App page](https://appshunter.io/ios/app/geo5-data-collector/id6446826835)

This application facilitates geological survey data collection in the field. It allows users to input data, utilize maps and GPS, and attach multimedia recordings. Data can be organized using standard or custom templates for any survey type.

**Highlights:** Field data input, Map and GPS integration, Photo, video, and audio recording, Standard and custom data templates, Borehole logging support

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Hydrology Formulator free?

Hydrology Formulator is free to download, with in-app purchases available.

### Is GEO5 Data Collector free?

GEO5 Data Collector is free to download, with no in-app purchases.

### Which has better reviews, Hydrology Formulator or GEO5 Data Collector?

Hydrology Formulator and GEO5 Data Collector are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Hydrology Formulator or GEO5 Data Collector have ads?

Neither Hydrology Formulator nor GEO5 Data Collector shows ads.

### Which is updated more often, Hydrology Formulator or GEO5 Data Collector?

Hydrology Formulator ships an update every 6 months, and GEO5 Data Collector every 3 months. Most recently, Hydrology Formulator was updated on November 10, 2026 and GEO5 Data Collector on November 3, 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.*