# Stone Identifier vs CEN Practice Test

The clearest difference is ads: CEN Practice Test at none against Stone Identifier's shown. On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Stone Identifier sells 10 in-app purchases, starting at $4.99 per 7 days and CEN Practice Test sells 1 in-app purchase, starting at $7.00 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Stone Identifier | CEN Practice Test |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (1.5K ratings)](https://appshunter.io/ios/app/stone-identifier-rock-finder/id1608573202/reviews)** | — |
| Number of ratings | **1.5K** | — |
| Positive reviews | 16.1% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 weeks | — |
| Monetization | Free with in-app purchases | — |
| Size | 185 MB | 3 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [App Holdings](https://appshunter.io/developer/808581339) | [Ambitionz Apps](https://appshunter.io/developer/1764753535) |

## What reviewers say

### Stone Identifier

[App page](https://appshunter.io/ios/app/stone-identifier-rock-finder/id1608573202)

Identify rocks, minerals, and crystals from photos with high accuracy. Explore their properties, discover nearby deposits on a map, and build your own digital collection. Learn fascinating facts about stones from around the world.

**Highlights:** Accurate rock identification from photos, Study physical and chemical properties, Discover nearby rock deposits on a map, Create and manage a personal rock collection, Learn about thousands of rock types

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RockPlatinum Weekly | $4.99 | per 7 days |
| RockPlatinum Weekly with Trial | $4.99 | per 7 days |
| RockPlatinum Weekly with Trial | $5.99 | per 7 days |
| RockPlatinum Weekly | $5.99 | per 7 days |
| RockPlatinum Weekly 7day Trial | $5.99 | per 7 days |
| RockPlatinum Monthly Access | $9.99 | per month |
| RockPlatinum Monthly + Trial | $9.99 | per month |
| Rock Seeker Platinum Annual | $29.99 | per year |
| RockPlatinum Annual 3day Trial | $29.99 | per year |
| Rock Seeker Platinum Annual | $39.99 | per year |

**What reviewers like**

- 🤗 Helpful for identifying rocks and minerals
- 🧠 Informative details on specimens
- 👨‍🏫 Educational for students and kids

**What reviewers complain about**

- 🤷‍♂️ Inconsistent and inaccurate identification results
- 💰 Expensive subscription model
- 🔒 Difficult to cancel subscription
- 🙅‍♀️ Limited free usage
- 🤖 Feels like an automated response rather than a knowledgeable app

**Reported bugs**

- App crashes or freezes during use
- Server connection issues prevent identification
- Incorrect or nonsensical identification results

**Requested features**

- Allow manual rock/mineral identification input
- Provide more detailed information on each specimen
- Improve accuracy of identification algorithms
- Offer a one-time purchase option instead of subscription


### CEN Practice Test

[App page](https://appshunter.io/ios/app/cen-practice-test/id6744170811)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CEN Practice Test | $7.00 | per month |


## Frequently asked questions

### Is Stone Identifier free?

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

### Is CEN Practice Test free?

CEN Practice Test is free to download, with in-app purchases available.

### Do Stone Identifier or CEN Practice Test have ads?

Stone Identifier shows ads; CEN Practice Test 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.*