# Hydrology Formulator vs Distant

The clearest difference is update cadence: Distant at fortnightly against Hydrology Formulator's every 6 months. Hydrology Formulator's advantage is iOS requirement (18.6 vs 26.0). 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 and Distant sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

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

Hydrology Formulator ships an update every 6 months, Distant fortnightly. The most recent releases landed on October 8, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Hydrology Formulator | Distant |
| --- | --- | --- |
| 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/distant-focus-timer/id6754052699/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 18 MB | 6 MB |
| Requires iOS | **18.6** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Odd Omens](https://appshunter.io/developer/1719285041) |

## 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 |


### Distant

[App page](https://appshunter.io/ios/app/distant-focus-timer/id6754052699)

Enhance concentration with a premium focus timer that blocks distracting applications. Track your progress with detailed analytics and celebrate achievements. Customize your sessions and themes for a personalized productivity experience.

**Highlights:** App blocking for distractions, Customizable focus sessions, Detailed progress analytics, Achievement system, Intuitive dark interface, Multiple timer modes

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Distant Full Access | $3.99 | one-time |


## Frequently asked questions

### Is Hydrology Formulator free?

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

### Is Distant free?

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

### Which has better reviews, Hydrology Formulator or Distant?

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

### Do Hydrology Formulator or Distant have ads?

Neither Hydrology Formulator nor Distant shows ads.

### Which is updated more often, Hydrology Formulator or Distant?

Hydrology Formulator ships an update every 6 months, and Distant fortnightly. Most recently, Hydrology Formulator was updated on October 8, 2026 and Distant on October 23, 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.*