# Acier MetalSpecs Pro vs EngiTools Pro

The clearest difference is in-app purchases: Acier MetalSpecs Pro at none against EngiTools Pro's 1. Acier MetalSpecs Pro also leads on ads (none vs shown) and update cadence (every 5 days vs fortnightly). EngiTools Pro's advantage is iOS requirement (13.0 vs 15.0). On price and device support there is nothing between them.

Both are free to download. EngiTools Pro sells 1 one-off in-app purchase. Acier MetalSpecs Pro asks for nothing beyond the download.

Acier MetalSpecs Pro ships an update every 5 days, EngiTools Pro fortnightly. The most recent releases landed on September 26, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Acier MetalSpecs Pro | EngiTools Pro |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 5 days** | Fortnightly |
| Monetization | Free | — |
| Size | 7 MB | 27 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hardik Modi](https://appshunter.io/developer/1330272057) | [Kui Yan Marc YU](https://appshunter.io/developer/1843673863) |

## What reviewers say

### Acier MetalSpecs Pro

[App page](https://appshunter.io/ios/app/acier-metalspecs-pro/id6478479578)

This app provides comprehensive data on stainless steel, including weight and tolerance calculations, chemical compositions, and mechanical properties. It allows users to compare equivalent grades and share product requirements.

**Highlights:** Weight and tolerance calculator, Chemical compositions, Mechanical properties, Equivalent grades comparison, Share product requirements

**Features:** macOS Compatibility

**In-app purchases:** none


### EngiTools Pro

[App page](https://appshunter.io/ios/app/engitools-pro/id6753354185)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to Premium | $4.99 | one-time |


## Frequently asked questions

### Is Acier MetalSpecs Pro free?

Acier MetalSpecs Pro is free to download, with no in-app purchases.

### Is EngiTools Pro free?

EngiTools Pro is free to download, with in-app purchases available.

### Do Acier MetalSpecs Pro or EngiTools Pro have ads?

EngiTools Pro shows ads; Acier MetalSpecs Pro does not.

### Which is updated more often, Acier MetalSpecs Pro or EngiTools Pro?

Acier MetalSpecs Pro ships an update every 5 days, and EngiTools Pro fortnightly. Most recently, Acier MetalSpecs Pro was updated on September 26, 2026 and EngiTools Pro on October 15, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*