# Water Flow Calculators vs IFSTA Driver/Operator 3

The clearest difference is rating: Water Flow Calculators at 4.6 against IFSTA Driver/Operator 3's 2.8. Water Flow Calculators also leads on in-app purchases (none vs 2) and review sentiment (60% vs 38%). IFSTA Driver/Operator 3's advantage is ratings volume (24 vs 5). On price, ads and device support there is nothing between them.

Both are free to download. IFSTA Driver/Operator 3 sells 2 one-off in-app purchases. Water Flow Calculators asks for nothing beyond the download.

Water Flow Calculators holds the better App Store score, 4.6 against 2.8. Both are backed by a comparable volume of ratings — 5 and 24 respectively. Written reviews point the same way: 60% of Water Flow Calculators's written reviews are positive against 38% of IFSTA Driver/Operator 3's.

Water Flow Calculators ships an update every 2 months, IFSTA Driver/Operator 3 every 5 months. The most recent releases landed on September 23, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Water Flow Calculators | IFSTA Driver/Operator 3 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (5 ratings)](https://appshunter.io/ios/app/water-flow-calculators/id1096155801/reviews)** | [2.8 (24 ratings)](https://appshunter.io/ios/app/ifsta-driveroperator-3/id6444622325/reviews) |
| Number of ratings | 5 | **24** |
| Positive reviews | **60.0% of reviews** | 37.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 41 MB | 75 MB |
| Requires iOS | **9.1** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Waterous](https://appshunter.io/developer/1096155800) | [IFSTA](https://appshunter.io/developer/495289396) |

## What reviewers say

### Water Flow Calculators

[App page](https://appshunter.io/ios/app/water-flow-calculators/id1096155801)

This educational app provides calculations for water flow using friction loss, smooth nozzle, NFA, and Iowa formulas. It's designed for professionals and students needing quick and accurate fluid dynamics computations.

**Highlights:** Friction loss calculations, Smooth nozzle calculations, NFA formula support, Iowa formula support, Fluid dynamics computations

**Features:** macOS Compatibility

**In-app purchases:** none


### IFSTA Driver/Operator 3

[App page](https://appshunter.io/ios/app/ifsta-driveroperator-3/id6444622325)

This app supports driver and operator training for pumping and aerial fire apparatus. It offers flashcards for key terms and exam preparation questions. An audiobook version of the manual is also available for purchase.

**Highlights:** Pumping and aerial apparatus training, Flashcards for key terms, Exam preparation with progress tracking, Audiobook with offline access, Covers 20 chapters of the manual

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Exam Prep Chapters | $14.99 | one-time |
| Unlock All Audiobooks | $32.99 | one-time |


## Frequently asked questions

### Is Water Flow Calculators free?

Water Flow Calculators is free to download, with no in-app purchases.

### Is IFSTA Driver/Operator 3 free?

IFSTA Driver/Operator 3 is free to download, with in-app purchases available.

### Which has better reviews, Water Flow Calculators or IFSTA Driver/Operator 3?

Water Flow Calculators is rated higher. Water Flow Calculators averages 4.6 out of 5 from 5 ratings, while IFSTA Driver/Operator 3 averages 2.8 from 24 ratings.

### Do Water Flow Calculators or IFSTA Driver/Operator 3 have ads?

Neither Water Flow Calculators nor IFSTA Driver/Operator 3 shows ads.

### Which is updated more often, Water Flow Calculators or IFSTA Driver/Operator 3?

Water Flow Calculators ships an update every 2 months, and IFSTA Driver/Operator 3 every 5 months. Most recently, Water Flow Calculators was updated on September 23, 2026 and IFSTA Driver/Operator 3 on September 22, 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.*