# Psychrometrics vs Control System Calc

The clearest difference is price: Control System Calc at Free against Psychrometrics's $3.99. Psychrometrics's advantage is ads (none vs shown). On update cadence, in-app purchases, device support and iOS requirement there is nothing between them.

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

Psychrometrics ships an update every 3 months, Control System Calc every 2 months. Both last shipped on October 20, 2026.

## The numbers

| Metric | Psychrometrics | Control System Calc |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.2 (12 ratings)](https://appshunter.io/ios/app/psychrometrics/id6455889577/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 20.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 2 MB | 9 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Wassim Murr](https://appshunter.io/developer/1474939474) | [洋 刘](https://appshunter.io/developer/6775317751) |

## 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


### Control System Calc

[App page](https://appshunter.io/ios/app/control-system-calc/id6791956580)

**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 Control System Calc free?

Control System Calc is free to download, with no in-app purchases.

### Do Psychrometrics or Control System Calc have ads?

Control System Calc shows ads; Psychrometrics does not.

### Which is updated more often, Psychrometrics or Control System Calc?

Psychrometrics ships an update every 3 months, and Control System Calc every 2 months. Most recently, Psychrometrics was updated on October 20, 2026 and Control System Calc on October 20, 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.*