# Rock Crystal Gem Identifier vs Magnetometer...

The clearest difference is ads: Rock Crystal Gem Identifier at none against Magnetometer...'s shown. Magnetometer...'s advantage is device support (3 vs 1) and iOS requirement (15.0 vs 26.0). On price and in-app purchases there is nothing between them.

Both are free to download. Rock Crystal Gem Identifier sells 2 in-app purchases, starting at $2.99 per 7 days and Magnetometer... sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Rock Crystal Gem Identifier | Magnetometer... |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rock-crystal-gem-identifier/id6754856661/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 7 months | — |
| Monetization | Freemium | — |
| Size | 26 MB | 97 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Streamlined Studios](https://appshunter.io/developer/1802378603) | [Olga Ivanova](https://appshunter.io/developer/1733570435) |

## What reviewers say

### Rock Crystal Gem Identifier

[App page](https://appshunter.io/ios/app/rock-crystal-gem-identifier/id6754856661)

Instantly identify rocks, crystals, and gemstones using AI. Snap a photo to get details on name, properties, and estimated value. Chat with an AI geologist for insights on origins and care, with all data saved privately on your device.

**Highlights:** AI Rock & Crystal Identification, Properties & Formation Details, Estimated Value with Reasoning, AI Geologist Chat, Private On-Device History, Simple and Fast Interface

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly | $2.99 | per 7 days |
| Premium Yearly | $29.99 | per year |


### Magnetometer...

[App page](https://appshunter.io/ios/app/magnetometer/id6808420517)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| magnetometer_by_oliva_subscription | $1.99 | per month |
| magnetometer_by_oliva_donation | $1.99 | one-time |


## Frequently asked questions

### Is Rock Crystal Gem Identifier free?

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

### Is Magnetometer... free?

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

### Do Rock Crystal Gem Identifier or Magnetometer... have ads?

Magnetometer... shows ads; Rock Crystal Gem Identifier does not.

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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.*