# Psychrometrics vs Digiduct

The clearest difference is price: Digiduct at Free against Psychrometrics's $3.99. Digiduct also leads on rating (4.6 vs 4.1). Psychrometrics's advantage is iOS requirement (18.6 vs 26.2). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

Digiduct is free to download; Psychrometrics costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Digiduct holds the better App Store score, 4.6 against 4.1. Both are backed by a comparable volume of ratings — 11 and 11 respectively.

Psychrometrics ships an update every 3 months, Digiduct every 2 months. Both last shipped on October 24, 2026.

## The numbers

| Metric | Psychrometrics | Digiduct |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [4.1 (11 ratings)](https://appshunter.io/ios/app/psychrometrics/id6455889577/reviews) | **[4.6 (11 ratings)](https://appshunter.io/ios/app/digiduct/id6738926359/reviews)** |
| Number of ratings | 11 | 11 |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Paid | **Ad-supported** |
| Size | 2 MB | 4 MB |
| Requires iOS | **18.6** | 26.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Wassim Murr](https://appshunter.io/developer/1474939474) | [Syska Hennessy Group](https://appshunter.io/developer/1782943081) |

## What reviewers say

### Psychrometrics

[App page](https://appshunter.io/ios/app/psychrometrics/id6455889577)

This app provides tools for analyzing and quantifying air and moisture properties. It offers a comprehensive calculator, interactive chart, and project management features for HVAC engineers, meteorologists, and industrial professionals. Supports both SI and IP units for versatile use.

**Highlights:** Comprehensive psychrometric calculator, Dual units support (SI/IP), Psychrometric process simulation, Interactive psychrometric chart, HVAC project management, Printable project reports, User-friendly interface

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

**In-app purchases:** none


### Digiduct

[App page](https://appshunter.io/ios/app/digiduct/id6738926359)

This HVAC tool assists professionals with duct sizing calculations based on ASHRAE standards. It supports multiple duct shapes and offers intelligent features to ensure accurate and reliable designs for real-world scenarios.

**Highlights:** Duct sizing for rectangular, round, and flat oval ducts, Customizable dimensions with locked values, Duct location intelligence for context-aware sizing, Calculations based on CFM, pressure drop, or velocity, Alerts for exceeding pressure drop or velocity limits

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

**In-app purchases:** none


## Frequently asked questions

### Is Psychrometrics free?

Psychrometrics costs $3.99, with no in-app purchases.

### Is Digiduct free?

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

### Which has better reviews, Psychrometrics or Digiduct?

Digiduct is rated higher. Psychrometrics averages 4.1 out of 5 from 11 ratings, while Digiduct averages 4.6 from 11 ratings.

### Do Psychrometrics or Digiduct have ads?

Neither Psychrometrics nor Digiduct shows ads.

### Which is updated more often, Psychrometrics or Digiduct?

Psychrometrics ships an update every 3 months, and Digiduct every 2 months. Most recently, Psychrometrics was updated on October 24, 2026 and Digiduct on October 24, 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.*