# Flow Test Calculator vs Joyfill

The clearest difference is rating: Joyfill at 5.0 against Flow Test Calculator's 4.1. Joyfill also leads on in-app purchases (none vs 4) and update cadence (every 14 months vs every 90 months). 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. Joyfill asks for nothing beyond the download.

Joyfill 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.

Flow Test Calculator ships an update every 90 months, Joyfill every 14 months. The most recent releases landed on September 18, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Flow Test Calculator | Joyfill |
| --- | --- | --- |
| 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/joyfill/id1567279615/reviews)** |
| Number of ratings | **63** | 3 |
| Positive reviews | 68.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 90 months | **Every 14 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 2 MB | 23 MB |
| Requires iOS | 14.0 | **13.4** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Larry Owens](https://appshunter.io/developer/496138296) | [Built To Create LLC](https://appshunter.io/developer/1444747269) |

## 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 |


### Joyfill

[App page](https://appshunter.io/ios/app/joyfill/id1567279615)

Streamline workflows with digital forms for inspections and client management. Create custom templates or use pre-built ones, and manage tasks collaboratively. Work offline and sync data when reconnected.

**Highlights:** Offline data entry, Custom form builder, Client management, Inspection scheduling, Collaborative calendar, Pre-built templates

**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 Joyfill free?

Joyfill is free to download, with no in-app purchases.

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

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

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

Neither Flow Test Calculator nor Joyfill shows ads.

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

Flow Test Calculator ships an update every 90 months, and Joyfill every 14 months. Most recently, Flow Test Calculator was updated on September 18, 2026 and Joyfill on October 6, 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.*