# Rock Identifier vs Geotechnical Engineering

The clearest difference is price: Rock Identifier at Free against Geotechnical Engineering's $0.49. Geotechnical Engineering's advantage is in-app purchases (none vs 3) and device support (3 vs 1). On ads there is nothing between them.

Rock Identifier is free to download; Geotechnical Engineering costs $0.49 up front. Rock Identifier sells 3 in-app purchases, starting at $2.99 per 7 days. Geotechnical Engineering asks for nothing beyond the download.

## The numbers

| Metric | Rock Identifier | Geotechnical Engineering |
| --- | --- | --- |
| Price | **Free** | $0.49 |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/rock-identifier-stone-id/id6755675894/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | — |
| Monetization | Freemium | — |
| Size | 14 MB | 23 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [志勇 杨](https://appshunter.io/developer/1137372489) | [Manish Kumar](https://appshunter.io/developer/1854995154) |

## What reviewers say

### Rock Identifier

[App page](https://appshunter.io/ios/app/rock-identifier-stone-id/id6755675894)

Instantly identify rocks, crystals, and minerals by taking or uploading a photo. Get detailed geological information, track your discoveries in a digital journal, and learn about their formation and uses. Perfect for collectors, students, and anyone curious about stones.

**Highlights:** Instant photo identification, Detailed geological data, Mineral collection journal, Field identification techniques, Formation and usage information, Regional smart distribution

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Week - 3 Days Free Trial | $2.99 | per 7 days |
| One Week | $4.99 | per 7 days |
| One Year | $14.99 | per year |


### Geotechnical Engineering

[App page](https://appshunter.io/ios/app/geotechnical-engineering/id6758993495)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Rock Identifier free?

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

### Is Geotechnical Engineering free?

Geotechnical Engineering costs $0.49, with no in-app purchases.

### Do Rock Identifier or Geotechnical Engineering have ads?

Neither Rock Identifier nor Geotechnical Engineering shows ads.

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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.*