# Marble Collector vs GPKData

The clearest difference is in-app purchases: GPKData at none against Marble Collector's 7. GPKData also leads on update cadence (weekly vs every 4 weeks) and iOS requirement (15.1 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Marble Collector sells 7 in-app purchases, starting at $3.95 per month. GPKData asks for nothing beyond the download.

Marble Collector ships an update every 4 weeks, GPKData weekly. The most recent releases landed on October 14, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Marble Collector | GPKData |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (111 ratings)](https://appshunter.io/ios/app/marble-collector-identifier/id6752577536/reviews)** | — |
| Number of ratings | **111** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 35 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Andres Narvaez](https://appshunter.io/developer/1352561689) | [Michael Graben](https://appshunter.io/developer/6780067532) |

## What reviewers say

### Marble Collector

[App page](https://appshunter.io/ios/app/marble-collector-identifier/id6752577536)

Instantly identify marble types, rarity, and estimated value by taking a photo. Access a knowledge base for historical details and manage your personal collection. Stay informed about marble shows and trading.

**Highlights:** Instant marble identification via photo, Price and rarity estimates, Marble knowledge base, Personal collection log, Updates on marble shows and trading

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $3.95 | per month |
| Trial Monthly Subscription | $5.39 | per month |
| 80% OFF | $10.49 | per year |
| 70% OFF | $16.49 | per year |
| 60% OFF | $21.49 | per year |
| Yearly Subscription | $44.90 | per year |
| 1 Week Trial | $44.90 | per year |


### GPKData

[App page](https://appshunter.io/ios/app/gpkdata/id6780067530)

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

**In-app purchases:** none


## Frequently asked questions

### Is Marble Collector free?

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

### Is GPKData free?

GPKData is free to download, with no in-app purchases.

### Do Marble Collector or GPKData have ads?

Neither Marble Collector nor GPKData shows ads.

### Which is updated more often, Marble Collector or GPKData?

Marble Collector ships an update every 4 weeks, and GPKData weekly. Most recently, Marble Collector was updated on October 14, 2026 and GPKData on October 6, 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.*