# ALGC vs Rock Stone Identifier

The clearest difference is in-app purchases: ALGC at none against Rock Stone Identifier's 3. ALGC also leads on device support (4 vs 2). Rock Stone Identifier's advantage is update cadence (weekly vs every 3 months). On price, ads and iOS requirement 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. ALGC asks for nothing beyond the download.

ALGC ships an update every 3 months, Rock Stone Identifier weekly. The most recent releases landed on October 27, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | ALGC | Rock Stone Identifier |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 50 MB | 69 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod, Apple TV** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Church of God of Prophecy (Oshawa)](https://appshunter.io/developer/1658925155) | [Zytnec LLC](https://appshunter.io/developer/1809376532) |

## What reviewers say

### ALGC

[App page](https://appshunter.io/ios/app/algc/id1658925153)

**Features:** macOS Compatibility

**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 ALGC free?

ALGC 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 ALGC or Rock Stone Identifier have ads?

Neither ALGC nor Rock Stone Identifier shows ads.

### Which is updated more often, ALGC or Rock Stone Identifier?

ALGC ships an update every 3 months, and Rock Stone Identifier weekly. Most recently, ALGC was updated on October 27, 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.*