# Shelf Sort vs Stack Cats

The clearest difference is in-app purchases: Shelf Sort at none against Stack Cats's 4. Shelf Sort also leads on iOS requirement (15.0 vs 17.6). Stack Cats's advantage is update cadence (every 4 days vs every 3 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Stack Cats sells 4 one-off in-app purchases. Shelf Sort asks for nothing beyond the download.

Shelf Sort ships an update every 3 weeks, Stack Cats every 4 days. The most recent releases landed on October 16, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Shelf Sort | Stack Cats |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Size | 149 MB | 42 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [TADAS MILIESKA](https://appshunter.io/developer/1842711071) | [桃花 秦](https://appshunter.io/developer/1877272960) |

## What reviewers say

### Shelf Sort

[App page](https://appshunter.io/ios/app/shelf-sort-cozy-sort-puzzle/id6782558260)

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

**In-app purchases:** none


### Stack Cats

[App page](https://appshunter.io/ios/app/stack-cats-cat-puzzle/id6814190493)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coins Pack | $0.99 | one-time |
| Remove Ads | $2.99 | one-time |
| Hint Pack | $2.99 | one-time |
| Bed Skin Pack | $3.99 | one-time |


## Frequently asked questions

### Is Shelf Sort free?

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

### Is Stack Cats free?

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

### Do Shelf Sort or Stack Cats have ads?

Both Shelf Sort and Stack Cats show ads.

### Which is updated more often, Shelf Sort or Stack Cats?

Shelf Sort ships an update every 3 weeks, and Stack Cats every 4 days. Most recently, Shelf Sort was updated on October 16, 2026 and Stack Cats on October 29, 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.*