# rare numbers vs Shellkeep

The clearest difference is in-app purchases: rare numbers at none against Shellkeep's 4. Shellkeep's advantage is ads (none vs shown) and update cadence (weekly vs every 4 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Shellkeep sells 4 one-off in-app purchases. rare numbers asks for nothing beyond the download.

rare numbers ships an update every 4 months, Shellkeep weekly. The most recent releases landed on October 1, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | rare numbers | Shellkeep |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (31 ratings)](https://appshunter.io/ios/app/shellkeep-card-collector/id6757331713/reviews)** |
| Number of ratings | — | **31** |
| Positive reviews | — | 90.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 13 MB | 58 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kevin Griffing](https://appshunter.io/developer/1772253467) | [Hamlab AB](https://appshunter.io/developer/1526276751) |

## What reviewers say

### rare numbers

[App page](https://appshunter.io/ios/app/rare-numbers/id6744262836)

**Features:** macOS Compatibility

**In-app purchases:** none


### Shellkeep

[App page](https://appshunter.io/ios/app/shellkeep-card-collector/id6757331713)

Collect, merge, and battle unique cards with thousands of possibilities. Hunt for ultra-rare holographic Shinies and compete with other players in live auctions and club bounties. Build your ultimate collection and test your luck.

**Highlights:** Generate and collect thousands of cards, Hunt for ultra-rare holographic Shinies, Bid, deal, and sell cards, Join clubs to team up with collectors, Compete in live auctions and daily deals, No advertisements

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Quick Gems | $0.99 | one-time |
| Small Gems | $2.99 | one-time |
| Big Gems | $6.99 | one-time |
| Mega Gems | $14.99 | one-time |


## Frequently asked questions

### Is rare numbers free?

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

### Is Shellkeep free?

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

### Do rare numbers or Shellkeep have ads?

rare numbers shows ads; Shellkeep does not.

### Which is updated more often, rare numbers or Shellkeep?

rare numbers ships an update every 4 months, and Shellkeep weekly. Most recently, rare numbers was updated on October 1, 2026 and Shellkeep on October 18, 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.*