# Fossati vs GuideToMetal

The clearest difference is in-app purchases: Fossati at none against GuideToMetal's 1. GuideToMetal's advantage is update cadence (every 10 days vs every 48 months) and iOS requirement (8.0 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. GuideToMetal sells 1 in-app purchase, starting at $17.99 per year. Fossati asks for nothing beyond the download.

Fossati ships an update every 48 months, GuideToMetal every 10 days. The most recent releases landed on October 26, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Fossati | GuideToMetal |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (2 ratings)](https://appshunter.io/ios/app/guidetometal/id1576343522/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 48 months | **Every 10 days** |
| Monetization | — | Free with in-app purchases |
| Size | 14 MB | 42 MB |
| Requires iOS | 15.6 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Omnys](https://appshunter.io/developer/332057196) | [TURKER DEMIRDISI DOKUM LIMITED SIRKETI](https://appshunter.io/developer/1573241865) |

## What reviewers say

### Fossati

[App page](https://appshunter.io/ios/app/fossati/id785492677)

**In-app purchases:** none


### GuideToMetal

[App page](https://appshunter.io/ios/app/guidetometal/id1576343522)

This app provides chemical analysis and standards for ferrous and non-ferrous compounds. It also offers charge calculation analysis and phase diagrams for select elements.

**Highlights:** Chemical analysis of compounds, Standards for ferrous and non-ferrous metals, Charge calculation analysis, Phase diagrams of elements, Supports iPhone and iPad

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual  Subscription | $17.99 | per year |


## Frequently asked questions

### Is Fossati free?

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

### Is GuideToMetal free?

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

### Do Fossati or GuideToMetal have ads?

Neither Fossati nor GuideToMetal shows ads.

### Which is updated more often, Fossati or GuideToMetal?

Fossati ships an update every 48 months, and GuideToMetal every 10 days. Most recently, Fossati was updated on October 26, 2026 and GuideToMetal 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.*