# Psychrometrics vs Process Engineer Calc

The clearest difference is price: Process Engineer Calc at Free against Psychrometrics's $3.99. Process Engineer Calc also leads on update cadence (every 10 days vs every 3 months). Psychrometrics's advantage is chart position (#178 vs unranked). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Process Engineer 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, Process Engineer Calc every 10 days. The most recent releases landed on September 9, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Psychrometrics | Process Engineer 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 | No |
| Update frequency | Every 3 months | **Every 10 days** |
| Monetization | Paid | — |
| Best chart rank | **#178** | — |
| Size | 2 MB | 11 MB |
| Requires iOS | 18.6 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Wassim Murr](https://appshunter.io/developer/1474939474) | [冯泰 蔡](https://appshunter.io/developer/1896641064) |

## What reviewers say

### Psychrometrics

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

**Currently charting:** #178 Top Paid · Utilities (US App Store)

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


### Process Engineer Calc

[App page](https://appshunter.io/ios/app/process-engineer-calc-lms/id6774295442)

**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 Process Engineer Calc free?

Process Engineer Calc is free to download, with no in-app purchases.

### Do Psychrometrics or Process Engineer Calc have ads?

Neither Psychrometrics nor Process Engineer Calc shows ads.

### Which is updated more often, Psychrometrics or Process Engineer Calc?

Psychrometrics ships an update every 3 months, and Process Engineer Calc every 10 days. Most recently, Psychrometrics was updated on September 9, 2026 and Process Engineer Calc on September 12, 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.*