# Rock Identification vs MathPen

The clearest difference is update cadence: MathPen at every 3 days against Rock Identification's every 3 months. Rock Identification's advantage is iOS requirement (13.0 vs 15.5). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Rock Identification sells 3 in-app purchases, starting at $6.99 per 7 days and MathPen sells 2 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Rock Identification ships an update every 3 months, MathPen every 3 days. The most recent releases landed on October 15, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Rock Identification | MathPen |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (30 ratings)](https://appshunter.io/ios/app/rock-identification-rock-id/id6529527573/reviews)** | — |
| Number of ratings | **30** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 days** |
| Monetization | Freemium | — |
| Size | 95 MB | 81 MB |
| Requires iOS | **13.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bhavinkumar Satashiya](https://appshunter.io/developer/1361485921) | [MicroClouds IT Consulting Services Inc.](https://appshunter.io/developer/6785151407) |

## What reviewers say

### Rock Identification

[App page](https://appshunter.io/ios/app/rock-identification-rock-id/id6529527573)

Identify rocks, minerals, crystals, and gems instantly by taking a photo. Access a comprehensive database with detailed information and educational content to explore the natural world.

**Highlights:** Instant photo identification, Comprehensive rock and mineral database, Detailed specimen descriptions, Geology and gemology educational content, User-friendly interface

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $6.99 | per 7 days |
| Monthly Subscription | $17.99 | per month |
| Yearly Subscription | $49.99 | per year |


### MathPen

[App page](https://appshunter.io/ios/app/mathpen/id6785151405)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Clock Module | $7.99 | one-time |
| All Operations | $9.99 | one-time |


## Frequently asked questions

### Is Rock Identification free?

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

### Is MathPen free?

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

### Do Rock Identification or MathPen have ads?

Neither Rock Identification nor MathPen shows ads.

### Which is updated more often, Rock Identification or MathPen?

Rock Identification ships an update every 3 months, and MathPen every 3 days. Most recently, Rock Identification was updated on October 15, 2026 and MathPen on October 16, 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.*