Flow Test Calculator vs IAAI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Flow Test Calculator
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.
- Hydrant flow rate calculation
- Maximum water system flow determination
- Hazen-Williams formula implementation
- Imperial unit support
- Future metric unit support
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This app is a simple flow test calculator to assist the user with determining flow rates of hydrants as well as determining if the maximum flow of the water system. A standard variation of the Hazen-Williams formula is used to determine the Max Flow Available. All units are in Imperial. Metric to come soon.
IAAI
Access event details, agendas, and check-in information for fire investigation professionals. This app connects members of an international association dedicated to suppressing arson through professional investigation.
- Event information access
- Agenda details
- Evaluation forms
- Check-in functionality
- Maps
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The International Association of Arson Investigators® (IAAI®) is an international professional association of more than 10,000 fire investigation professionals, united by a strong commitment to suppress the crime of arson through professional fire investigation. Using this app you can access IAAI event information, agenda, evaluations, check-in, maps, and more!
Screenshots
Verdict
The clearest difference is rating: IAAI at 5.0 against Flow Test Calculator's 4.1. IAAI also leads on in-app purchases (none vs 4) and update cadence (every 5 months vs every 90 months). Flow Test Calculator's advantage is ratings volume (63 vs 4). On price, ads, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Flow Test Calculator sells 4 one-off in-app purchases. IAAI asks for nothing beyond the download.
IAAI 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 4, so its average is the more settled of the two.
Flow Test Calculator ships an update every 90 months, IAAI every 5 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.
| Parameter | Flow Test Calculator | IAAI |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (63 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 68.8% of reviews | — |
| Number of ratings | 63 — better | 4 |
| Update frequency | Every 90 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 14.1 |
| Further details — not scored | ||
| Size | 2 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Larry Owens | Results at Hand Software LLC |
Customer experience
Flow Test Calculator
IAAI
In-app purchases
Flow Test Calculator
- Disable Purchase Requests$0.99
- Disable Purchase Requests 1.99$1.99
- Disable Purchase Request 4.99$4.99
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- Disable Purchase Requests 9.99$9.99
IAAI
No in-app purchases
Questions
Is Flow Test Calculator free?
Is IAAI free?
Which has better reviews, Flow Test Calculator or IAAI?
Do Flow Test Calculator or IAAI have ads?
Which is updated more often, Flow Test Calculator or IAAI?
Other comparisons
