# Psychrometric Chart vs Duct Construction

The clearest difference is price: Duct Construction at $0.99 against Psychrometric Chart's $59.99. Duct Construction also leads on chart position (#106 vs unranked). Psychrometric Chart's advantage is rating (4.4 vs 1.0) and review sentiment (33% vs 0%). On ads, in-app purchases and monetization model there is nothing between them.

Psychrometric Chart costs $59.99 and Duct Construction $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Psychrometric Chart holds the better App Store score, 4.4 against 1.0. That said, the two scores are not equally well evidenced: Psychrometric Chart has 34 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 33% of Psychrometric Chart's written reviews are positive against 0% of Duct Construction's.

Psychrometric Chart ships an update every 3 months, Duct Construction every 10 months. The most recent releases landed on September 20, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Psychrometric Chart | Duct Construction |
| --- | --- | --- |
| Price | $59.99 | **$0.99** |
| Rating | **[4.4 (34 ratings)](https://appshunter.io/ios/app/psychrometric-chart/id1026273214/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/duct-construction/id6443518338/reviews) |
| Number of ratings | **34** | 1 |
| Positive reviews | **33.3% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 10 months |
| Monetization | Paid | Paid |
| Best chart rank | — | **#106** |
| Size | 32 MB | 1 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Pheinex, LLC](https://appshunter.io/developer/996932317) | [Wassim Murr](https://appshunter.io/developer/1474939474) |

## What reviewers say

### Psychrometric Chart

[App page](https://appshunter.io/ios/app/psychrometric-chart/id1026273214)

An interactive tool for HVAC engineers to create and manipulate psychrometric charts. Model various air processes, add and adjust state points with live property updates, and save multiple charts. Export your designs as PDFs or via AirPrint.

**Highlights:** Interactive psychrometric charts, Model air mixing and heating/cooling, Live state point adjustment, SI and IP unit support, Save and manage multiple charts, Export charts as PDF, AirPrint compatibility

**Features:** Vision Pro support

**In-app purchases:** none


### Duct Construction

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

**Currently charting:** #106 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


## Frequently asked questions

### Is Psychrometric Chart free?

Psychrometric Chart costs $59.99, with no in-app purchases.

### Is Duct Construction free?

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

### Which has better reviews, Psychrometric Chart or Duct Construction?

Psychrometric Chart is rated higher. Psychrometric Chart averages 4.4 out of 5 from 34 ratings, while Duct Construction averages 1.0 from 1 ratings.

### Do Psychrometric Chart or Duct Construction have ads?

Neither Psychrometric Chart nor Duct Construction shows ads.

### Which is updated more often, Psychrometric Chart or Duct Construction?

Psychrometric Chart ships an update every 3 months, and Duct Construction every 10 months. Most recently, Psychrometric Chart was updated on September 20, 2026 and Duct Construction on September 25, 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.*