# EYT Card Sorting vs StoneID Rock Identifier

The clearest difference is price: StoneID Rock Identifier at Free against EYT Card Sorting's $9.99. StoneID Rock Identifier also leads on ratings volume (3 vs 1). EYT Card Sorting's advantage is rating (5.0 vs 3.3) and in-app purchases (none vs 3). On ads and device support there is nothing between them.

StoneID Rock Identifier is free to download; EYT Card Sorting costs $9.99 up front. StoneID Rock Identifier sells 3 in-app purchases, starting at $3.99 per 7 days. EYT Card Sorting asks for nothing beyond the download.

EYT Card Sorting holds the better App Store score, 5.0 against 3.3. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

EYT Card Sorting ships an update every 3 months, StoneID Rock Identifier every 6 months. The most recent releases landed on October 3, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | EYT Card Sorting | StoneID Rock Identifier |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/eyt-card-sorting/id918911275/reviews)** | [3.3 (3 ratings)](https://appshunter.io/ios/app/stoneid-rock-identifier/id6741160166/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 6 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 95 MB | 88 MB |
| Requires iOS | **15.6** | 18.1 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [University of Wollongong](https://appshunter.io/developer/527113169) | [Kesifler Dunyasi Ltd.](https://appshunter.io/developer/1173478543) |

## What reviewers say

### EYT Card Sorting

[App page](https://appshunter.io/ios/app/eyt-card-sorting/id918911275)

This iPad-based game assesses children's cognitive flexibility by having them sort objects based on changing rules. It's designed for quick, engaging evaluations of executive functioning in young children. Data can be emailed for research purposes.

**Highlights:** Cognitive flexibility assessment, Rule-based object sorting, Executive functioning evaluation, Data export via email, Multilingual support, Research-based design

**In-app purchases:** none


### StoneID Rock Identifier

[App page](https://appshunter.io/ios/app/stoneid-rock-identifier/id6741160166)

Identify rocks, stones, and gems using their scientific properties. Explore detailed descriptions, high-quality images, and advanced filters. Perfect for students, collectors, and outdoor enthusiasts interested in geology.

**Highlights:** Identify rocks by scientific properties, Filter and compare rocks by geological criteria, In-depth descriptions and high-quality images, Advanced scientific filters, Pocket geologist functionality

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $3.99 | per 7 days |
| Monthly Subscription | $5.99 | per month |
| Annual Subscription | $9.99 | per year |


## Frequently asked questions

### Is EYT Card Sorting free?

EYT Card Sorting costs $9.99, with no in-app purchases.

### Is StoneID Rock Identifier free?

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

### Which has better reviews, EYT Card Sorting or StoneID Rock Identifier?

EYT Card Sorting is rated higher. EYT Card Sorting averages 5.0 out of 5 from 1 ratings, while StoneID Rock Identifier averages 3.3 from 3 ratings.

### Do EYT Card Sorting or StoneID Rock Identifier have ads?

Neither EYT Card Sorting nor StoneID Rock Identifier shows ads.

### Which is updated more often, EYT Card Sorting or StoneID Rock Identifier?

EYT Card Sorting ships an update every 3 months, and StoneID Rock Identifier every 6 months. Most recently, EYT Card Sorting was updated on October 3, 2026 and StoneID Rock Identifier on October 24, 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.*