# Stack Sort vs ルート21

The clearest difference is update cadence: ルート21 at every 3 days against Stack Sort's fortnightly. Stack Sort's advantage is iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Stack Sort ships an update fortnightly, ルート21 every 3 days. The most recent releases landed on September 18, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Stack Sort | ルート21 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (5 ratings)](https://appshunter.io/ios/app/stack-sort-color-cube-puzzle/id6755076474/reviews)** | — |
| Number of ratings | **5** | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Fortnightly | **Every 3 days** |
| Monetization | Ad-supported | — |
| Size | 225 MB | 37 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BAF, Ltd.](https://appshunter.io/developer/1501471707) | [sandwichproject](https://appshunter.io/developer/378488766) |

## What reviewers say

### Stack Sort

[App page](https://appshunter.io/ios/app/stack-sort-color-cube-puzzle/id6755076474)

Rearrange blocks to build towers of identical colors in this satisfying brain-training puzzle game. Enjoy simple controls, unlimited stacking, and a relaxing experience with no time limits. Perfect for those who love organizing and a good mental challenge.

**Highlights:** Rearrange blocks to build color towers, Stack identical blocks, Satisfying gameplay and clean visuals, Easy to learn, hard to master, Unlimited stacking freedom, Customizable block skins, No time limits, offline play supported

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

**In-app purchases:** none


### ルート21

[App page](https://appshunter.io/ios/app/21/id6765792708)

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

**In-app purchases:** none


## Frequently asked questions

### Is Stack Sort free?

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

### Is ルート21 free?

ルート21 is free to download, with no in-app purchases.

### Do Stack Sort or ルート21 have ads?

Both Stack Sort and ルート21 show ads.

### Which is updated more often, Stack Sort or ルート21?

Stack Sort ships an update fortnightly, and ルート21 every 3 days. Most recently, Stack Sort was updated on September 18, 2026 and ルート21 on September 23, 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.*