# Mec Eng Tools vs SPK

The clearest difference is in-app purchases: SPK at none against Mec Eng Tools's 10. SPK also leads on update cadence (fortnightly vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Mec Eng Tools ships an update every 2 months, SPK fortnightly. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Mec Eng Tools | SPK |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 21.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Free with in-app purchases | — |
| Size | 41 MB | 30 MB |
| Requires iOS | 15.1 | **14.0.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Eduardo Almeida](https://appshunter.io/developer/906209752) | [REDOUANE ABDELOUARIT](https://appshunter.io/developer/1768614100) |

## 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 |


### SPK

[App page](https://appshunter.io/ios/app/spk-sugarbeet-processing/id6686404962)

**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 SPK free?

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

### Do Mec Eng Tools or SPK have ads?

Neither Mec Eng Tools nor SPK shows ads.

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

Mec Eng Tools ships an update every 2 months, and SPK fortnightly. Most recently, Mec Eng Tools was updated on November 6, 2026 and SPK on October 30, 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.*