# Mec Eng Tools vs Vapour Pressures

The clearest difference is price: Mec Eng Tools at Free against Vapour Pressures's $3.99. Mec Eng Tools also leads on review sentiment (21% vs 0%) and update cadence (every 2 months vs every 6 months). Vapour Pressures's advantage is in-app purchases (none vs 10). On ads and device support there is nothing between them.

Mec Eng Tools is free to download; Vapour Pressures costs $3.99 up front. Mec Eng Tools sells 10 one-off in-app purchases. Vapour Pressures asks for nothing beyond the download.

Mec Eng Tools ships an update every 2 months, Vapour Pressures every 6 months. The most recent releases landed on November 6, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | Mec Eng Tools | Vapour Pressures |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | — | **[2.0 (1 ratings)](https://appshunter.io/ios/app/vapour-pressures/id6738324417/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | **21.1% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 41 MB | 14 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Eduardo Almeida](https://appshunter.io/developer/906209752) | [Irving Josue Cortes Iturriaga](https://appshunter.io/developer/1750836580) |

## What reviewers say

### Mec Eng Tools

[App page](https://appshunter.io/ios/app/mec-eng-tools/id1046405234)

This utility app calculates thermodynamic properties using IAPWS-97 equations. It allows users to determine various properties like pressure, temperature, enthalpy, and specific volume based on different input parameters. The app supports multiple units for calculations.

**Highlights:** IAPWS-97 equation calculations, Calculate properties from pressure and temperature, Calculate properties from pressure and enthalpy, Calculate properties from pressure and entropy, Calculate properties from pressure and quality, Support for multiple units

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade Steam Tables | $3.99 | one-time |
| Stress & Strain | $4.99 | one-time |
| Machine Design | $4.99 | one-time |
| Pressure Vessels | $4.99 | one-time |
| Fluids & Piping Pack | $6.99 | one-time |
| Thermal Pack: Steam Complement | $6.99 | one-time |
| Thermal Sciences Pack | $10.49 | one-time |
| Solids & Design Pack | $10.49 | one-time |
| Collection: Steam Complement | $24.49 | one-time |
| Complete Engineering Collection | $27.99 | one-time |


### Vapour Pressures

[App page](https://appshunter.io/ios/app/vapour-pressures/id6738324417)

Calculate vapor pressures and boiling points quickly and accurately with this tool. It features two extensive databases and supports various units, making it ideal for engineers, scientists, and students working with phase-change phenomena.

**Highlights:** Vapor pressure calculation, Boiling point calculation, Extensive substance databases, Support for multiple units, Multi-language support, No data collection

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

**In-app purchases:** none


## Frequently asked questions

### Is Mec Eng Tools free?

Mec Eng Tools is free to download, with in-app purchases available.

### Is Vapour Pressures free?

Vapour Pressures costs $3.99, with no in-app purchases.

### Do Mec Eng Tools or Vapour Pressures have ads?

Neither Mec Eng Tools nor Vapour Pressures shows ads.

### Which is updated more often, Mec Eng Tools or Vapour Pressures?

Mec Eng Tools ships an update every 2 months, and Vapour Pressures every 6 months. Most recently, Mec Eng Tools was updated on November 6, 2026 and Vapour Pressures on November 11, 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.*