# Sample for Science vs Rock Stone Identifier

The clearest difference is in-app purchases: Sample for Science at none against Rock Stone Identifier's 3. Sample for Science also leads on iOS requirement (12.0 vs 15.0). Rock Stone Identifier's advantage is update cadence (weekly vs every 6 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Rock Stone Identifier sells 3 in-app purchases, starting at $6.99 per 7 days. Sample for Science asks for nothing beyond the download.

Sample for Science ships an update every 6 weeks, Rock Stone Identifier weekly. The most recent releases landed on October 19, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Sample for Science | Rock Stone Identifier |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 58 MB | 69 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | +4 | 4+ |
| Developer | [Universidade Federal Fluminense - UFF](https://appshunter.io/developer/739312311) | [Zytnec LLC](https://appshunter.io/developer/1809376532) |

## What reviewers say

### Sample for Science

[App page](https://appshunter.io/ios/app/sample-for-science/id6470819452)

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

**In-app purchases:** none


### Rock Stone Identifier

[App page](https://appshunter.io/ios/app/rock-stone-identifier-gemai/id6751190998)

Instantly identify rocks, minerals, and gemstones using AI. Explore detailed geological data, check authenticity, and discover market values. Ideal for collectors, students, and professionals.

**Highlights:** AI-powered rock and gemstone recognition, Instant identification of minerals and crystals, Detailed geological and gemstone encyclopedia, Authenticity and fake stone detection, Market value and origin insights, Collection cataloging and organization, Spiritual and healing properties information

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Plan | $6.99 | per 7 days |
| Yearly Plan | $29.99 | per year |
| Lifetime Plan | $39.99 | one-time |


## Frequently asked questions

### Is Sample for Science free?

Sample for Science is free to download, with no in-app purchases.

### Is Rock Stone Identifier free?

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

### Do Sample for Science or Rock Stone Identifier have ads?

Neither Sample for Science nor Rock Stone Identifier shows ads.

### Which is updated more often, Sample for Science or Rock Stone Identifier?

Sample for Science ships an update every 6 weeks, and Rock Stone Identifier weekly. Most recently, Sample for Science was updated on October 19, 2026 and Rock Stone Identifier on October 20, 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.*