HVACSoftware Compatibility & Drivers2MildHVAC Technician

HVAC professional needs a simple duct calculator app equivalent to the old Johnstone Supply Toolkit but can't find a compatible replacement.

The preferred app is no longer compatible with new phones, and alternative apps on the store don't meet the user's needs for simplicity and functionality.

Opp. Score

Severity

2Mild

Willingness to Pay

none

Added

Aug 11, 2026

Workarounds Described

tries multiple other duct calculator apps from Android store

Implied Software Gaps

HVAC app compatibility with newer mobile OS versions
Simple duct calculator app with user experience matching a physical ductulator

App Concept

DuctSizer On-The-Go

A lightweight mobile duct calculator app that replicates the classic sliding ductulator experience with modern compatibility. Users input CFM and friction, and get instant sizing results without complex menus. It's better than current alternatives because it strips away unnecessary features and focuses solely on quick, reliable duct sizing.

Key Features

Simple interface with CFM and friction inputs mimicking a physical ductulator
Supports both round and rectangular duct conversions
Saves commonly used values for quick access
Offline functionality for use in the field

Target Users: HVAC technicians and installers who prefer a no-frills, mobile duct sizing tool

Revenue Model: One-time purchase of $4.99 on app stores, with no ads or subscriptions

Existing Solutions Mentioned

Johnstone Supply Toolkit app

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