# Duct Construction vs Pre

The clearest difference is price: Pre at Free against Duct Construction's $0.99. Pre also leads on update cadence (every 2 months vs every 10 months) and iOS requirement (13.0 vs 17.6). Duct Construction's advantage is chart position (#184 vs unranked). On ads, in-app purchases and device support there is nothing between them.

Pre is free to download; Duct Construction costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Duct Construction ships an update every 10 months, Pre every 2 months. The most recent releases landed on September 25, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Duct Construction | Pre |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/duct-construction/id6443518338/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 months** |
| Monetization | Paid | — |
| Best chart rank | **#184** | — |
| Size | 1 MB | 46 MB |
| Requires iOS | 17.6 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Wassim Murr](https://appshunter.io/developer/1474939474) | [Carrier Corporation](https://appshunter.io/developer/542004889) |

## What reviewers say

### Duct Construction

[App page](https://appshunter.io/ios/app/duct-construction/id6443518338)

**Currently charting:** #184 Top Paid · Productivity (US App Store)

This app helps determine duct construction and reinforcement options based on duct size and system pressure class. It provides condensed lists of suitable options, saving time spent on manual calculations and table lookups. Results are based on industry standards for galvanized steel duct sheets.

**Highlights:** Duct size range from 2" to 120", Pressure classes up to 4 in.wg, Calculates duct weights per linear foot, Determines required duct gauge and reinforcement spacing, Clear illustrations for reinforcement types, Simple and effective UI design

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

**In-app purchases:** none


### Pre

[App page](https://appshunter.io/ios/app/pre-startup/id6479706553)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Duct Construction free?

Duct Construction costs $0.99, with no in-app purchases.

### Is Pre free?

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

### Do Duct Construction or Pre have ads?

Neither Duct Construction nor Pre shows ads.

### Which is updated more often, Duct Construction or Pre?

Duct Construction ships an update every 10 months, and Pre every 2 months. Most recently, Duct Construction was updated on September 25, 2026 and Pre on September 21, 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.*