# Engineering Cookbook vs PT Chart Refrigerants EU

The clearest difference is rating: Engineering Cookbook at 4.5 against PT Chart Refrigerants EU's 3.7. PT Chart Refrigerants EU's advantage is update cadence (every 14 months vs every 34 months) and iOS requirement (11.0 vs 13.0). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Engineering Cookbook holds the better App Store score, 4.5 against 3.7. Both are backed by a comparable volume of ratings — 6 and 3 respectively.

Engineering Cookbook ships an update every 34 months, PT Chart Refrigerants EU every 14 months. Both last shipped on November 6, 2026.

## The numbers

| Metric | Engineering Cookbook | PT Chart Refrigerants EU |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (6 ratings)](https://appshunter.io/ios/app/engineering-cookbook/id376850735/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/pt-chart-refrigerants-eu/id632697935/reviews) |
| Number of ratings | **6** | 3 |
| Positive reviews | 72.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 34 months | **Every 14 months** |
| Monetization | Free | Free |
| Size | 45 MB | 85 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Loren Cook Company](https://appshunter.io/developer/376850738) | [Honeywell International, Inc.](https://appshunter.io/developer/311222963) |

## What reviewers say

### Engineering Cookbook

[App page](https://appshunter.io/ios/app/engineering-cookbook/id376850735)

A handy reference guide for mechanical designers, offering quick access to essential information on fan basics, system and duct design, motors, heating, refrigeration, and conversion factors.

**Highlights:** Fan Basics, System Design, Duct Design, Motors & Drives, Heating & Refrigeration, Formulas & Conversion Factors

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

**In-app purchases:** none


### PT Chart Refrigerants EU

[App page](https://appshunter.io/ios/app/pt-chart-refrigerants-eu/id632697935)

This reference tool provides HVAC mechanics with a digital pressure-temperature (PT) chart. Users can select refrigerants to access necessary data and quickly calculate superheat and subcool averages directly from their iPhone or iPad.

**Highlights:** Digital pressure-temperature chart, Refrigerant selection, Field data access, Superheat and subcool calculations, Touchscreen interface

**In-app purchases:** none


## Frequently asked questions

### Is Engineering Cookbook free?

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

### Is PT Chart Refrigerants EU free?

PT Chart Refrigerants EU is free to download, with no in-app purchases.

### Which has better reviews, Engineering Cookbook or PT Chart Refrigerants EU?

Engineering Cookbook is rated higher. Engineering Cookbook averages 4.5 out of 5 from 6 ratings, while PT Chart Refrigerants EU averages 3.7 from 3 ratings.

### Do Engineering Cookbook or PT Chart Refrigerants EU have ads?

Neither Engineering Cookbook nor PT Chart Refrigerants EU shows ads.

### Which is updated more often, Engineering Cookbook or PT Chart Refrigerants EU?

Engineering Cookbook ships an update every 34 months, and PT Chart Refrigerants EU every 14 months. Most recently, Engineering Cookbook was updated on November 6, 2026 and PT Chart Refrigerants EU on November 6, 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.*