# e vs Salt Shack Minerals

The clearest difference is price: e at Free against Salt Shack Minerals's $19.99. e also leads on iOS requirement (15.1 vs 17.6). Salt Shack Minerals's advantage is rating (5.0 vs 3.0) and in-app purchases (none vs 3). On ads and device support there is nothing between them.

e is free to download; Salt Shack Minerals costs $19.99 up front. e sells 3 in-app purchases, starting at $22.99 per 3 months. Salt Shack Minerals asks for nothing beyond the download.

Salt Shack Minerals holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 6 respectively. Written reviews point the same way: 67% of e's written reviews are positive against 100% of Salt Shack Minerals's.

e ships an update every 2 months, Salt Shack Minerals weekly. The most recent releases landed on October 19, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | e | Salt Shack Minerals |
| --- | --- | --- |
| Price | **Free** | $19.99 |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/e-rocks/id1479976121/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/salt-shack-minerals/id6756032045/reviews)** |
| Number of ratings | 2 | **6** |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#55** |
| Size | 52 MB | 156 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mark Wrigley](https://appshunter.io/developer/1479976120) | [Benjamin Secret](https://appshunter.io/developer/1812229865) |

## What reviewers say

### e

[App page](https://appshunter.io/ios/app/e-rocks/id1479976121)

Access a comprehensive database of over 6200 mineral species with detailed facts, including names, formulas, occurrences, and properties. This offline-capable app provides quick lookups and links to a larger online mineral catalog.

**Highlights:** 6200+ mineral species database, Detailed species information, Offline access, Links to e-Rocks.com catalog, Quick and easy to use

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| e-Rocks Collectors 3 Months | $22.99 | per 3 months |
| e-Rocks Collectors 6 Months | $39.00 | per 6 months |
| e-Rocks Collectors Annual | $79.00 | per year |


### Salt Shack Minerals

[App page](https://appshunter.io/ios/app/salt-shack-minerals/id6756032045)

**Currently charting:** #55 Top Paid · Education (US App Store)

Explore minerals and Earth science through illustrated articles and interactive quizzes. Build and manage a digital catalog of your own mineral collection. Ideal for students, collectors, and anyone curious about geology.

**Highlights:** Bite-sized mineralogy lessons, Detailed mineral profiles, Earth science library, Over 300 quizzes, Collection cataloguing tool, Progress tracking

**In-app purchases:** none


## Frequently asked questions

### Is e free?

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

### Is Salt Shack Minerals free?

Salt Shack Minerals costs $19.99, with no in-app purchases.

### Which has better reviews, e or Salt Shack Minerals?

Salt Shack Minerals is rated higher. e averages 3.0 out of 5 from 2 ratings, while Salt Shack Minerals averages 5.0 from 6 ratings.

### Do e or Salt Shack Minerals have ads?

Neither e nor Salt Shack Minerals shows ads.

### Which is updated more often, e or Salt Shack Minerals?

e ships an update every 2 months, and Salt Shack Minerals weekly. Most recently, e was updated on October 19, 2026 and Salt Shack Minerals on October 28, 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.*