# Flow Test Calculator vs Hydrant Flow Test Calculator

The clearest difference is rating: Hydrant Flow Test Calculator at 5.0 against Flow Test Calculator's 4.1. Hydrant Flow Test Calculator also leads on in-app purchases (none vs 4) and review sentiment (100% vs 69%). Flow Test Calculator's advantage is ratings volume (63 vs 3). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Flow Test Calculator sells 4 one-off in-app purchases. Hydrant Flow Test Calculator asks for nothing beyond the download.

Hydrant Flow Test Calculator holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: Flow Test Calculator has 63 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 69% of Flow Test Calculator's written reviews are positive against 100% of Hydrant Flow Test Calculator's.

Flow Test Calculator ships an update every 90 months, Hydrant Flow Test Calculator every 5 weeks. The most recent releases landed on September 18, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Flow Test Calculator | Hydrant Flow Test Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (63 ratings)](https://appshunter.io/ios/app/flow-test-calculator/id853530759/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/hydrant-flow-test-calculator/id6759503350/reviews)** |
| Number of ratings | **63** | 3 |
| Positive reviews | 68.8% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 90 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 2 MB | 38 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Larry Owens](https://appshunter.io/developer/496138296) | [Saleel Anthrathodiyil](https://appshunter.io/developer/1879071811) |

## What reviewers say

### Flow Test Calculator

[App page](https://appshunter.io/ios/app/flow-test-calculator/id853530759)

Calculate hydrant flow rates and determine maximum water system flow. This tool uses a standard variation of the Hazen-Williams formula for calculations. Imperial units are currently supported, with metric coming soon.

**Highlights:** Hydrant flow rate calculation, Maximum water system flow determination, Hazen-Williams formula implementation, Imperial unit support, Future metric unit support

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Disable Purchase Requests | $0.99 | one-time |
| Disable Purchase Requests 1.99 | $1.99 | one-time |
| Disable Purchase Request 4.99 | $4.99 | one-time |
| Disable Purchase Requests 9.99 | $9.99 | one-time |


### 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 Flow Test Calculator free?

Flow Test Calculator is free to download, with in-app purchases available.

### Is Hydrant Flow Test Calculator free?

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

### Which has better reviews, Flow Test Calculator or Hydrant Flow Test Calculator?

Hydrant Flow Test Calculator is rated higher. Flow Test Calculator averages 4.1 out of 5 from 63 ratings, while Hydrant Flow Test Calculator averages 5.0 from 3 ratings.

### Do Flow Test Calculator or Hydrant Flow Test Calculator have ads?

Neither Flow Test Calculator nor Hydrant Flow Test Calculator shows ads.

### Which is updated more often, Flow Test Calculator or Hydrant Flow Test Calculator?

Flow Test Calculator ships an update every 90 months, and Hydrant Flow Test Calculator every 5 weeks. Most recently, Flow Test Calculator was updated on September 18, 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.*