# Custom Observer App vs Crystal Identifier & Rock ID

The clearest difference is in-app purchases: Custom Observer App at none against Crystal Identifier & Rock ID's 2. On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Crystal Identifier & Rock ID sells 2 in-app purchases, starting at $4.99 per 7 days. Custom Observer App asks for nothing beyond the download.

## The numbers

| Metric | Custom Observer App | Crystal Identifier & Rock ID |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (17 ratings)](https://appshunter.io/ios/app/crystal-identifier-and-rock-id/id6748074407/reviews)** |
| Number of ratings | — | **17** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | — |
| Monetization | — | Free with in-app purchases |
| Size | 151 MB | 28 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Aleut Community of St. Paul Island Tribal Government](https://appshunter.io/developer/1329178887) | [Tahir Alievi](https://appshunter.io/developer/1821207262) |

## What reviewers say

### Custom Observer App

[App page](https://appshunter.io/ios/app/custom-observer-app/id6736385664)

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

**In-app purchases:** none


### Crystal Identifier & Rock ID

[App page](https://appshunter.io/ios/app/crystal-identifier-and-rock-id/id6748074407)

Instantly identify crystals and estimate their value by scanning them with your phone's camera. Get detailed information on crystal type, rarity, and market worth using advanced AI analysis. Track your collection and favorite finds with an intuitive history feature.

**Highlights:** Instant crystal identification via camera scan, Estimated market value assessment, Detailed information on rarity and properties, AI-powered analysis of crystal features, Scan history and favorites list, Intuitive user interface

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AI Langauge Learning Pro | $4.99 | per 7 days |
| AI Langauge Learning Trial | $4.99 | per 7 days |


## Frequently asked questions

### Is Custom Observer App free?

Custom Observer App is free to download, with no in-app purchases.

### Is Crystal Identifier & Rock ID free?

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

### Do Custom Observer App or Crystal Identifier & Rock ID have ads?

Neither Custom Observer App nor Crystal Identifier & Rock ID 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.*