# Rainbow Stacking vs STACK

The clearest difference is in-app purchases: Rainbow Stacking at none against STACK's 5. Rainbow Stacking also leads on iOS requirement (12.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. STACK sells 5 one-off in-app purchases. Rainbow Stacking asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on September 25, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Rainbow Stacking | STACK |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/rainbow-stacking/id1644587632/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Ad-supported | — |
| Size | 46 MB | 25 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kevin Merz](https://appshunter.io/developer/1642543757) | [Jonathan Rycx](https://appshunter.io/developer/6776471796) |

## What reviewers say

### Rainbow Stacking

[App page](https://appshunter.io/ios/app/rainbow-stacking/id1644587632)

A level-based block-stacking game with simple and beautiful graphics. Players stack blocks to reach a target line, offering a straightforward yet engaging puzzle experience.

**Highlights:** Level-based gameplay, Block stacking mechanics, Reach target line objective, Simple graphics, Beautiful design

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

**In-app purchases:** none


### STACK

[App page](https://appshunter.io/ios/app/stack-tower-builder/id6796613603)

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 250 Gems | $0.99 | one-time |
| 700 Gems | $2.99 | one-time |
| 1,500 Gems | $5.99 | one-time |
| Full Game | $7.99 | one-time |
| 3,500 Gems | $9.99 | one-time |


## Frequently asked questions

### Is Rainbow Stacking free?

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

### Is STACK free?

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

### Do Rainbow Stacking or STACK have ads?

Both Rainbow Stacking and STACK show ads.

### Which is updated more often, Rainbow Stacking or STACK?

Rainbow Stacking ships an update every 2 weeks, and STACK every 2 weeks. Most recently, Rainbow Stacking was updated on September 25, 2026 and STACK on September 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.*