# Sigtasa vs Metal +

The clearest difference is in-app purchases: Sigtasa at none against Metal +'s 1. Sigtasa also leads on update cadence (every 2 months vs every 4 months). Metal +'s advantage is iOS requirement (13.0 vs 16.6). On price, ads and device support there is nothing between them.

Both are free to download. Metal + sells 1 one-off in-app purchase. Sigtasa asks for nothing beyond the download.

Sigtasa ships an update every 2 months, Metal + every 4 months. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Sigtasa | Metal + |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (12 ratings)](https://appshunter.io/ios/app/metal-plus/id6446039096/reviews)** |
| Number of ratings | — | **12** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | — | Free with in-app purchases |
| Size | 17 MB | 5 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Christian Pierre Mendoza Sanchez](https://appshunter.io/developer/1509995338) | [Mohamed Saad](https://appshunter.io/developer/1291109619) |

## What reviewers say

### Sigtasa

[App page](https://appshunter.io/ios/app/sigtasa/id1553535186)

**Features:** macOS Compatibility

**In-app purchases:** none


### Metal +

[App page](https://appshunter.io/ios/app/metal-plus/id6446039096)

Easily calculate the weight and price of various metal forms and alloys. Save your projects and access calculations offline. This tool supports multiple units and metal types for precise results.

**Highlights:** Calculate weight of round, sheet, tube, rectangle forms, Supports steel, aluminum, nickel, copper, gold, silver alloys, Calculate paint surface area, Weight converter, Price per kilogram/ton converter, Save items and projects, Offline functionality

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $4.99 | one-time |


## Frequently asked questions

### Is Sigtasa free?

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

### Is Metal + free?

Metal + is free to download, with in-app purchases available.

### Do Sigtasa or Metal + have ads?

Neither Sigtasa nor Metal + shows ads.

### Which is updated more often, Sigtasa or Metal +?

Sigtasa ships an update every 2 months, and Metal + every 4 months. Most recently, Sigtasa was updated on October 25, 2026 and Metal + on October 24, 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.*