# TracPipe System Guide vs Duct Sizer Calc HVAC

The clearest difference is price: TracPipe System Guide at Free against Duct Sizer Calc HVAC's $0.99. TracPipe System Guide also leads on in-app purchases (none vs 1). Duct Sizer Calc HVAC's advantage is update cadence (every 3 weeks vs every 9 months) and iOS requirement (13.0 vs 15.1). On ads and device support there is nothing between them.

TracPipe System Guide is free to download; Duct Sizer Calc HVAC costs $0.99 up front. Duct Sizer Calc HVAC sells 1 one-off in-app purchase. TracPipe System Guide asks for nothing beyond the download.

TracPipe System Guide ships an update every 9 months, Duct Sizer Calc HVAC every 3 weeks. The most recent releases landed on October 2, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | TracPipe System Guide | Duct Sizer Calc HVAC |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[3.8 (9 ratings)](https://appshunter.io/ios/app/tracpipe-system-guide/id996885333/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 weeks** |
| Monetization | Ad-supported | — |
| Size | 33 MB | 34 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Omega Flex, Inc.](https://appshunter.io/developer/996885332) | [Rizvan Adzhoian](https://appshunter.io/developer/1891746079) |

## What reviewers say

### TracPipe System Guide

[App page](https://appshunter.io/ios/app/tracpipe-system-guide/id996885333)

This application helps users calculate the correct size of flexible gas piping for installations. It supports various sizing methods and gas types, providing accurate results based on selected parameters. Users can also access updated design guides and installation instructions.

**Highlights:** Flexible gas piping sizing calculator, Supports Longest Run or Branch length methods, Calculates capacity based on gas type, pressure, and pressure drop, Easy-to-use calculator wheel, Access to updated Design Guide and Installation Instructions, Find a Sales Representative feature

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

**In-app purchases:** none


### Duct Sizer Calc HVAC

[App page](https://appshunter.io/ios/app/duct-sizer-calc-hvac/id6764646921)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |


## Frequently asked questions

### Is TracPipe System Guide free?

TracPipe System Guide is free to download, with no in-app purchases.

### Is Duct Sizer Calc HVAC free?

Duct Sizer Calc HVAC costs $0.99, and also offers in-app purchases.

### Do TracPipe System Guide or Duct Sizer Calc HVAC have ads?

Neither TracPipe System Guide nor Duct Sizer Calc HVAC shows ads.

### Which is updated more often, TracPipe System Guide or Duct Sizer Calc HVAC?

TracPipe System Guide ships an update every 9 months, and Duct Sizer Calc HVAC every 3 weeks. Most recently, TracPipe System Guide was updated on October 2, 2026 and Duct Sizer Calc HVAC on September 23, 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.*