# HVAC Pipe Sizer Plus vs CaptiveAire Toolbox

The clearest difference is price: CaptiveAire Toolbox at Free against HVAC Pipe Sizer Plus's $13.99. CaptiveAire Toolbox also leads on rating (5.0 vs 3.0) and update cadence (every 8 days vs every 15 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.

CaptiveAire Toolbox is free to download; HVAC Pipe Sizer Plus costs $13.99 up front. Neither carries in-app purchases, so what you see is what you pay.

CaptiveAire Toolbox holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

HVAC Pipe Sizer Plus ships an update every 15 months, CaptiveAire Toolbox every 8 days. The most recent releases landed on November 6, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | HVAC Pipe Sizer Plus | CaptiveAire Toolbox |
| --- | --- | --- |
| Price | $13.99 | **Free** |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/hvac-pipe-sizer-plus/id352069594/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/captiveaire-toolbox/id6765656560/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 8 days** |
| Monetization | Paid | **Free** |
| Size | 2 MB | 71 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [CaptiveAire Systems, Inc.](https://appshunter.io/developer/1896026735) |

## What reviewers say

### HVAC Pipe Sizer Plus

[App page](https://appshunter.io/ios/app/hvac-pipe-sizer-plus/id352069594)

This utility app combines three specialized pipe sizing tools for HVAC systems: liquid, steam, and gas. It offers flexible input options, unit conversions, and an equipment locator for comprehensive HVAC design.

**Highlights:** Liquid pipe sizing, Steam pipe sizing with steam table calculator, Gas pipe sizing (low and high pressure), HVAC Equipment Locator, Slider controls for input adjustments, English and Metric unit display

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

**In-app purchases:** none


### CaptiveAire Toolbox

[App page](https://appshunter.io/ios/app/captiveaire-toolbox/id6765656560)

This app provides over 40 HVAC and building-systems engineering calculators, offering quick field calculations for engineers, contractors, and technicians. It covers cooling, heating, ventilation, electrical sizing, piping, and valve sizing, all based on standard industry references.

**Highlights:** 40+ HVAC engineering calculators, Cooling and heating load calculations, Ventilation and airflow analysis, Electrical sizing tools, Piping and structural calculations, Valve and flow sizing, Reference data and psychrometric chart

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

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Pipe Sizer Plus free?

HVAC Pipe Sizer Plus costs $13.99, with no in-app purchases.

### Is CaptiveAire Toolbox free?

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

### Which has better reviews, HVAC Pipe Sizer Plus or CaptiveAire Toolbox?

CaptiveAire Toolbox is rated higher. HVAC Pipe Sizer Plus averages 3.0 out of 5 from 1 ratings, while CaptiveAire Toolbox averages 5.0 from 1 ratings.

### Do HVAC Pipe Sizer Plus or CaptiveAire Toolbox have ads?

Neither HVAC Pipe Sizer Plus nor CaptiveAire Toolbox shows ads.

### Which is updated more often, HVAC Pipe Sizer Plus or CaptiveAire Toolbox?

HVAC Pipe Sizer Plus ships an update every 15 months, and CaptiveAire Toolbox every 8 days. Most recently, HVAC Pipe Sizer Plus was updated on November 6, 2026 and CaptiveAire Toolbox on November 9, 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.*