# Water Flow Calculators vs IFSTA Instructor 9

The clearest difference is review sentiment: Water Flow Calculators at 60% against IFSTA Instructor 9's 0%. Water Flow Calculators also leads on rating (4.6 vs 3.2) and in-app purchases (none vs 2). IFSTA Instructor 9's advantage is ratings volume (17 vs 5). On price, ads and device support there is nothing between them.

Both are free to download. IFSTA Instructor 9 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 3.2. Both are backed by a comparable volume of ratings — 5 and 17 respectively. Written reviews point the same way: 60% of Water Flow Calculators's written reviews are positive against 0% of IFSTA Instructor 9's.

Water Flow Calculators ships an update every 2 months, IFSTA Instructor 9 every 10 months. The most recent releases landed on October 24, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Water Flow Calculators | IFSTA Instructor 9 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (5 ratings)](https://appshunter.io/ios/app/water-flow-calculators/id1096155801/reviews)** | [3.2 (17 ratings)](https://appshunter.io/ios/app/ifsta-instructor-9/id1604765850/reviews) |
| Number of ratings | 5 | **17** |
| Positive reviews | **60.0% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 10 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 41 MB | 124 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 Instructor 9

[App page](https://appshunter.io/ios/app/ifsta-instructor-9/id1604765850)

This app provides instructor training for fire and emergency services professionals, aligning with NFPA 1041 standards. It includes free flashcards and access to the first chapter of the audiobook and exam prep, with full access available via in-app purchases.

**Highlights:** NFPA 1041 compliant instructor training, Flashcards for key terms and definitions, Exam preparation with 565 validated questions, Progress tracking for study sessions, Full audiobook narration with offline access, Chapter 1 free access for all features

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Exam Prep | $14.99 | one-time |
| Audiobook | $30.99 | one-time |


## Frequently asked questions

### Is Water Flow Calculators free?

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

### Is IFSTA Instructor 9 free?

IFSTA Instructor 9 is free to download, with in-app purchases available.

### Which has better reviews, Water Flow Calculators or IFSTA Instructor 9?

Water Flow Calculators is rated higher. Water Flow Calculators averages 4.6 out of 5 from 5 ratings, while IFSTA Instructor 9 averages 3.2 from 17 ratings.

### Do Water Flow Calculators or IFSTA Instructor 9 have ads?

Neither Water Flow Calculators nor IFSTA Instructor 9 shows ads.

### Which is updated more often, Water Flow Calculators or IFSTA Instructor 9?

Water Flow Calculators ships an update every 2 months, and IFSTA Instructor 9 every 10 months. Most recently, Water Flow Calculators was updated on October 24, 2026 and IFSTA Instructor 9 on October 21, 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.*