# GM10 vs ref

The clearest difference is in-app purchases: ref at none against GM10's 8. ref also leads on ads (none vs shown) and rating (4.9 vs 4.7). On price, ratings volume, update cadence and device support there is nothing between them.

Both are free to download. GM10 sells 8 in-app purchases, starting at $14.99 per month. ref asks for nothing beyond the download.

ref holds the better App Store score, 4.9 against 4.7. Both are backed by a comparable volume of ratings — 22 and 9 respectively.

Both ship on a similar rhythm, roughly weekly. The most recent releases landed on October 15, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | GM10 | ref |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (22 ratings)](https://appshunter.io/ios/app/gm10/id6444276022/reviews) | **[4.9 (9 ratings)](https://appshunter.io/ios/app/ref-ology/id6747456171/reviews)** |
| Number of ratings | **22** | 9 |
| Positive reviews | 94.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Weekly | Weekly |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 138 MB | 126 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 17+ | 9+ |
| Developer | [Matthew Billman](https://appshunter.io/developer/1653539349) | [Ref-ology](https://appshunter.io/developer/1821525658) |

## What reviewers say

### GM10

[App page](https://appshunter.io/ios/app/gm10/id6444276022)

Connect with fellow trading card enthusiasts on a dedicated social platform. Discover news, engage with the community, buy, sell, and even run your own brand shop. Find local shows to bridge the generation gap in collecting.

**Highlights:** Community engagement and news, Find local trading card shows, User profiles with transaction history, Online buying and selling, In-app randomizer for breaks, Brand shops for selling merchandise

**Features:** macOS Compatibility

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Monthly | $14.99 | per month |
| Premium | $24.99 | per month |
| BLUE | $1.99 | one-time |
| RED | $3.99 | one-time |
| PURPLE | $7.99 | one-time |
| GOLD | $9.99 | one-time |
| BLACK | $14.99 | one-time |
| GEM | $19.99 | one-time |


### ref

[App page](https://appshunter.io/ios/app/ref-ology/id6747456171)

This app helps referees master the inner game through reflection, presence, and practice. It offers educational resources, game film breakdowns, and live events to sharpen skills and deepen understanding. Built by officials, for officials, it fosters a community for growth and networking.

**Highlights:** Training videos and game film analysis, Expert breakdowns, Live webinars and mentoring, On-demand sessions, Interactive space for confidence and awareness, Community for questions and feedback

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

**In-app purchases:** none


## Frequently asked questions

### Is GM10 free?

GM10 is free to download, with in-app purchases available.

### Is ref free?

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

### Which has better reviews, GM10 or ref?

ref is rated higher. GM10 averages 4.7 out of 5 from 22 ratings, while ref averages 4.9 from 9 ratings.

### Do GM10 or ref have ads?

GM10 shows ads; ref does not.

### Which is updated more often, GM10 or ref?

GM10 ships an update weekly, and ref weekly. Most recently, GM10 was updated on October 15, 2026 and ref on October 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*