# Hydrology Formulator vs WIMS Mobile

The clearest difference is in-app purchases: WIMS Mobile at none against Hydrology Formulator's 1. WIMS Mobile also leads on update cadence (every 5 weeks vs every 6 months) and iOS requirement (16.0 vs 18.6). On price, ads and device support there is nothing between them.

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

Hydrology Formulator ships an update every 6 months, WIMS Mobile every 5 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Hydrology Formulator | WIMS Mobile |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hydrology-formulator/id346512904/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 weeks** |
| Monetization | Free | — |
| Size | 18 MB | 84 MB |
| Requires iOS | 18.6 | **16.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [ITE WIMS WATER INFORMATION (PTY) LTD](https://appshunter.io/developer/1738207943) |

## 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 |


### WIMS Mobile

[App page](https://appshunter.io/ios/app/wims-mobile/id6758763030)

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

**In-app purchases:** none


## Frequently asked questions

### Is Hydrology Formulator free?

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

### Is WIMS Mobile free?

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

### Do Hydrology Formulator or WIMS Mobile have ads?

Neither Hydrology Formulator nor WIMS Mobile shows ads.

### Which is updated more often, Hydrology Formulator or WIMS Mobile?

Hydrology Formulator ships an update every 6 months, and WIMS Mobile every 5 weeks. Most recently, Hydrology Formulator was updated on October 24, 2026 and WIMS Mobile on October 25, 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.*