Flow Test Calculator
By Larry Owens
Flow Test Calculator is a specialized utility for fire service and water utility professionals to perform hydraulic calculations on iOS.
The App DNA
What makes this app unique?
It replaces manual calculation sheets with a digital interface, removing the cognitive cost of field-based hydraulic math for hydrant testing.
For Fire service personnel and water utility professionals requiring field-based hydraulic calculations.
What does it look like?
Key features
Calculates hydrant flow rates using a standard variation of the Hazen-Williams formula.
Determines the maximum flow available for a water system based on user-provided inputs.
Allows users to save and pre-fill default numbers for recurring calculations, reducing friction for repeat professional use.
How much does it cost?
The app is distributed as a free utility without visible monetization gates or subscription tiers.
Velocity
Dormant developmentUX improvementsplatform expansionShow more...
Development has ceased, with no updates or feature releases in 1,877 days. The project remains in a dormant state, having not received any maintenance or content additions for over five years. Given the lack of activity, there is no current development momentum.
Who built it?
User Sentiment
What do users think recently?
Review voice lately leans mixed. Users appreciate the core flow calculation tool provides a reliable and simple interface for field-based fire pump testing.
How are ratings & reviews evolving?
What users say, by theme
- The core flow calculation tool provides a reliable and simple interface for field-based fire pump testing
- The app fails to launch or display content correctly on current iOS versions following the latest update
15 of 15 recent reviews analyzed · moderate confidence · Mixed overall
Read the full review analysisUnlock 1 more frustration theme and 2 user requests, each backed by review evidence.
Access the full report for freeCompetition
Competitive landscape for Flow Test Calculator
How's the Productivity market?
Flow Test Calculator maintains a niche utility position with a 4.1-star rating across 63 total ratings. The five-year development gap limits its competitive standing against modern, cross-platform alternatives.
The rivals identified
The Analyst's Read
Key takeaways for Flow Test Calculator
Where is it heading?
The market for field-based utility tools is shifting toward cross-platform accessibility and integrated data workflows. Flow Test Calculator's lack of development and platform limitations leave it exposed to abandonment by professional users who require reliable, modern tools.
- Critical launch failures on modern iOS versions prevent core utility, which drives negative sentiment and user churn.
- The five-year development gap signals that Flow Test Calculator is in maintenance mode, leaving it vulnerable to newer, cross-platform competitors.
The SWOT
- Reliable Hazen-Williams calculation engine
- Automated pitot reading integration
Next best moves
Rebuild launch logic for current iOS versions because the app currently crashes for many users → restore basic utility
The counter-intuitive read
The app's five-year development silence is its biggest competitive risk…
Read the full takeBottom line
Flow Test Calculator remains a reliable calculation tool, but the current launch failures on modern iOS versions render it unusable for many professionals. Addressing these stability regressions is the only way to restore its utility and prevent total user churn.
Unlock 2 critical frictions, 1 market threat and the analyst’s take.
Access the full report for freeFAQ
Is Flow Test Calculator available on Android?
Does Flow Test Calculator work on the latest iOS versions?
Is Flow Test Calculator suitable for professional fire pump testing?
Sources
- [1] App Store
Report last updated