# Stellar Stack Puzzle vs Universe Invader 2

The clearest difference is price: Stellar Stack Puzzle at Free against Universe Invader 2's $0.99. Stellar Stack Puzzle also leads on iOS requirement (12.0 vs 15.0). Universe Invader 2's advantage is ads (none vs shown). On in-app purchases and device support there is nothing between them.

Stellar Stack Puzzle is free to download; Universe Invader 2 costs $0.99 up front. Stellar Stack Puzzle sells 6 one-off in-app purchases and Universe Invader 2 sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Stellar Stack Puzzle | Universe Invader 2 |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[4.5 (8 ratings)](https://appshunter.io/ios/app/universe-invader-2-premium/id6757993668/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | — | Every 6 months |
| Monetization | — | Paid |
| Size | 124 MB | 384 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Areeb Zahid](https://appshunter.io/developer/1715377928) | [Gcenter](https://appshunter.io/developer/1473786034) |

## What reviewers say

### Stellar Stack Puzzle

[App page](https://appshunter.io/ios/app/stellar-stack-puzzle/id6599849625)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 2K Coins | $1.99 | one-time |
| 4K Coins | $3.99 | one-time |
| 8K Coins | $4.99 | one-time |
| 12K Coins | $8.99 | one-time |
| 20K Coins | $12.99 | one-time |
| 35K Coins | $14.99 | one-time |


### Universe Invader 2

[App page](https://appshunter.io/ios/app/universe-invader-2-premium/id6757993668)

Engage in intense space combat with powerful spacecraft against endless alien invaders. This premium version offers a full, uninterrupted arcade-style shooter experience with all content unlocked from the start. Enjoy fast-paced action, modern visuals, and challenging boss battles.

**Highlights:** Ad-free, uninterrupted gameplay, Full content unlocked, Classic arcade-style shooter, Intense boss battles, Offline play supported, Upgrade spacecraft and firepower

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Starter Pack | $0.99 | one-time |
| Instant Rank Up 2 | $1.99 | one-time |
| Instant Rank Up 3 | $4.99 | one-time |
| Instant Rank Up 4 | $7.99 | one-time |
| Instant Rank Up 5 | $9.99 | one-time |
| Instant Rank Up 6 | $11.99 | one-time |
| Instant Rank Up 7 | $14.99 | one-time |
| Instant Rank Up 8 | $19.99 | one-time |
| Instant Rank Up 9 | $24.99 | one-time |
| Instant Rank Up 10 | $29.99 | one-time |


## Frequently asked questions

### Is Stellar Stack Puzzle free?

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

### Is Universe Invader 2 free?

Universe Invader 2 costs $0.99, and also offers in-app purchases.

### Do Stellar Stack Puzzle or Universe Invader 2 have ads?

Stellar Stack Puzzle shows ads; Universe Invader 2 does not.

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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.*