# Mec Eng Tools vs imOS CRX plus

The clearest difference is in-app purchases: imOS CRX plus at none against Mec Eng Tools's 10. Mec Eng Tools's advantage is review sentiment (20% vs 12%). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Mec Eng Tools sells 10 one-off in-app purchases. imOS CRX plus asks for nothing beyond the download.

Mec Eng Tools ships an update every 2 months, imOS CRX plus every 5 months. The most recent releases landed on November 13, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Mec Eng Tools | imOS CRX plus |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.8 (6 ratings)](https://appshunter.io/ios/app/imos-crx-plus/id1287312949/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | **20.0% of reviews** | 11.8% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 41 MB | 7 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Eduardo Almeida](https://appshunter.io/developer/906209752) | [illumagic](https://appshunter.io/developer/1139644730) |

## 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 |


### imOS CRX plus

[App page](https://appshunter.io/ios/app/imos-crx-plus/id1287312949)

This app allows you to program and control LED lights on compatible devices via Bluetooth. You can define LED intensities at specific time points, choose gradual or instant transitions, and select from various lighting modes to customize your light settings.

**Highlights:** Bluetooth LED control, Program light intensities, Define time points for settings, Gradual or instant transitions, Multiple lighting modes, Customize light settings

**Features:** macOS Compatibility

**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 imOS CRX plus free?

imOS CRX plus is free to download, with no in-app purchases.

### Do Mec Eng Tools or imOS CRX plus have ads?

Neither Mec Eng Tools nor imOS CRX plus shows ads.

### Which is updated more often, Mec Eng Tools or imOS CRX plus?

Mec Eng Tools ships an update every 2 months, and imOS CRX plus every 5 months. Most recently, Mec Eng Tools was updated on November 13, 2026 and imOS CRX plus on November 3, 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.*