# Flow Test Calculator vs FireWorks App Pro

The clearest difference is in-app purchases: FireWorks App Pro at none against Flow Test Calculator's 4. FireWorks App Pro also leads on update cadence (every 5 weeks vs every 90 months). 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. FireWorks App Pro asks for nothing beyond the download.

Flow Test Calculator ships an update every 90 months, FireWorks App Pro every 5 weeks. The most recent releases landed on September 18, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Flow Test Calculator | FireWorks App Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.1 (63 ratings)](https://appshunter.io/ios/app/flow-test-calculator/id853530759/reviews)** | — |
| Number of ratings | **63** | — |
| Positive reviews | 68.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 90 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 2 MB | 74 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Larry Owens](https://appshunter.io/developer/496138296) | [Eprsys](https://appshunter.io/developer/1691723675) |

## 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 |


### FireWorks App Pro

[App page](https://appshunter.io/ios/app/fireworks-app-pro/id6738319906)

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

**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 FireWorks App Pro free?

FireWorks App Pro is free to download, with no in-app purchases.

### Do Flow Test Calculator or FireWorks App Pro have ads?

Neither Flow Test Calculator nor FireWorks App Pro shows ads.

### Which is updated more often, Flow Test Calculator or FireWorks App Pro?

Flow Test Calculator ships an update every 90 months, and FireWorks App Pro every 5 weeks. Most recently, Flow Test Calculator was updated on September 18, 2026 and FireWorks App Pro on September 30, 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.*