# Rock Identifier | Scan Stone vs DuoView

The clearest difference is ads: DuoView at none against Rock Identifier | Scan Stone's shown. DuoView also leads on ratings volume (60 vs 5). Rock Identifier | Scan Stone's advantage is rating (4.6 vs 4.2). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. Rock Identifier | Scan Stone sells 2 in-app purchases, starting at $6.99 per 7 days and DuoView sells 11 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Rock Identifier | Scan Stone holds the better App Store score, 4.6 against 4.2. That said, the two scores are not equally well evidenced: DuoView has 60 ratings behind it against 5, so its average is the more settled of the two.

Rock Identifier | Scan Stone ships an update fortnightly, DuoView every 10 days. The most recent releases landed on October 6, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Rock Identifier | Scan Stone | DuoView |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (5 ratings)](https://appshunter.io/ios/app/rock-identifier-scan-stone/id6760641960/reviews)** | [4.2 (60 ratings)](https://appshunter.io/ios/app/duoview-dual-camera-recorder/id6761603349/reviews) |
| Number of ratings | 5 | **60** |
| Positive reviews | — | 25.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 10 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 212 MB | 110 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [MEGA PROJEKT GROUP DOO Nis](https://appshunter.io/developer/1885467538) | [Wachanga LTD](https://appshunter.io/developer/1521231523) |

## What reviewers say

### Rock Identifier | Scan Stone

[App page](https://appshunter.io/ios/app/rock-identifier-scan-stone/id6760641960)

Instantly identify rocks, crystals, and gemstones using your phone's camera. Get detailed scientific information, build a digital collection, and learn about the mineral world. Perfect for collectors, geologists, and nature enthusiasts.

**Highlights:** Instant AI-powered rock identification, Detailed scientific information on specimens, Build and manage a digital rock collection, Geology guide with origin and composition, Save identified finds with notes and locations

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 week with 3 days trial | $6.99 | per 7 days |
| 1 week with 3 days trial | $8.99 | per 7 days |


### DuoView

[App page](https://appshunter.io/ios/app/duoview-dual-camera-recorder/id6761603349)

Record simultaneously with multiple cameras to capture different perspectives in a single take. This app allows for split-screen or picture-in-picture layouts, high-quality video output, and real-time control for efficient content creation.

**Highlights:** Dual camera recording, Portrait and landscape in one take, Split screen and overlay modes, High-quality video (4K, 1080p), Real-time preview and control, Time-lapse recording

**Features:** macOS Compatibility

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full aaccess | $3.99 | per month |
| Full aaccess | $4.99 | per 7 days |
| Full aaccess | $14.99 | per year |
| Full aaccess | $18.99 | per year |
| Full aaccess | $19.99 | per year |
| Full aaccess | $24.99 | per year |
| Full aaccess | $7.99 | one-time |
| Full aaccess | $9.99 | one-time |
| Full aaccess | $14.99 | one-time |
| Full aaccess | $19.99 | one-time |
| Full aaccess | $24.99 | one-time |


## Frequently asked questions

### Is Rock Identifier | Scan Stone free?

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

### Is DuoView free?

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

### Which has better reviews, Rock Identifier | Scan Stone or DuoView?

Rock Identifier | Scan Stone is rated higher. Rock Identifier | Scan Stone averages 4.6 out of 5 from 5 ratings, while DuoView averages 4.2 from 60 ratings.

### Do Rock Identifier | Scan Stone or DuoView have ads?

Rock Identifier | Scan Stone shows ads; DuoView does not.

### Which is updated more often, Rock Identifier | Scan Stone or DuoView?

Rock Identifier | Scan Stone ships an update fortnightly, and DuoView every 10 days. Most recently, Rock Identifier | Scan Stone was updated on October 6, 2026 and DuoView on October 17, 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.*