# How Deep Is It? vs Hydrant Flow Test Calculator

The clearest difference is review sentiment: Hydrant Flow Test Calculator at 100% against How Deep Is It?'s 57%. Hydrant Flow Test Calculator also leads on rating (5.0 vs 4.1) and update cadence (every 5 weeks vs every 18 months). How Deep Is It?'s advantage is ratings volume (13 vs 3) and iOS requirement (7.0 vs 15.1). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Hydrant Flow Test Calculator holds the better App Store score, 5.0 against 4.1. Both are backed by a comparable volume of ratings — 13 and 3 respectively. Written reviews point the same way: 57% of How Deep Is It?'s written reviews are positive against 100% of Hydrant Flow Test Calculator's.

How Deep Is It? ships an update every 18 months, Hydrant Flow Test Calculator every 5 weeks. Both last shipped on October 4, 2026.

## The numbers

| Metric | How Deep Is It? | Hydrant Flow Test Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (13 ratings)](https://appshunter.io/ios/app/how-deep-is-it/id955364125/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/hydrant-flow-test-calculator/id6759503350/reviews)** |
| Number of ratings | **13** | 3 |
| Positive reviews | 57.1% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 5 weeks** |
| Monetization | Free | Free |
| Size | 15 MB | 38 MB |
| Requires iOS | **7.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Tom Soderling](https://appshunter.io/developer/955364124) | [Saleel Anthrathodiyil](https://appshunter.io/developer/1879071811) |

## What reviewers say

### How Deep Is It?

[App page](https://appshunter.io/ios/app/how-deep-is-it/id955364125)

Explore physics concepts hands-on with this app. It uses your device's accelerometer to demonstrate falling body equations, allowing you to visualize and hear the distance traveled. Experience classic physics principles in an interactive way.

**Highlights:** Illustrates falling body equations, Uses device accelerometer, Large text distance display, Audio feedback for distance, Ad-free experience

**Features:** macOS Compatibility

**In-app purchases:** none


### Hydrant Flow Test Calculator

[App page](https://appshunter.io/ios/app/hydrant-flow-test-calculator/id6759503350)

This tool simplifies hydrant flow testing by calculating total GPM from pitot pressures. It allows for outlet settings, flow extrapolation with a Supply vs Demand curve, and plotting demand points for PASS/FAIL results. Save test data with location and project details for future reference.

**Highlights:** Calculate total GPM from pitot pressures, Configure outlet diameter and hydrant coefficients, Extrapolate flow with Supply vs Demand curve, Plot demand points for PASS/FAIL analysis, Save test results with date, time, and project info, Log hydrant locations via GPS, Review saved test history

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is How Deep Is It? free?

How Deep Is It? is free to download, with no in-app purchases.

### Is Hydrant Flow Test Calculator free?

Hydrant Flow Test Calculator is free to download, with no in-app purchases.

### Which has better reviews, How Deep Is It? or Hydrant Flow Test Calculator?

Hydrant Flow Test Calculator is rated higher. How Deep Is It? averages 4.1 out of 5 from 13 ratings, while Hydrant Flow Test Calculator averages 5.0 from 3 ratings.

### Do How Deep Is It? or Hydrant Flow Test Calculator have ads?

Neither How Deep Is It? nor Hydrant Flow Test Calculator shows ads.

### Which is updated more often, How Deep Is It? or Hydrant Flow Test Calculator?

How Deep Is It? ships an update every 18 months, and Hydrant Flow Test Calculator every 5 weeks. Most recently, How Deep Is It? was updated on October 4, 2026 and Hydrant Flow Test Calculator on October 4, 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.*