# Zero Below Zero vs Universe Invader 2

The clearest difference is ads: Zero Below Zero at none against Universe Invader 2's shown. Zero Below Zero also leads on rating (5.0 vs 4.8). Universe Invader 2's advantage is update cadence (every 5 weeks vs every 6 months) and ratings volume (85 vs 6). On price, review sentiment, in-app purchases and monetization model there is nothing between them.

Both are free to download. Zero Below Zero sells 1 one-off in-app purchase and Universe Invader 2 sells 43 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Zero Below Zero holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Universe Invader 2 has 85 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 100% of Zero Below Zero's written reviews are positive against 94% of Universe Invader 2's.

Zero Below Zero ships an update every 6 months, Universe Invader 2 every 5 weeks. The most recent releases landed on September 30, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Zero Below Zero | Universe Invader 2 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/zero-below-zero/id1512598160/reviews)** | [4.8 (85 ratings)](https://appshunter.io/ios/app/universe-invader-2-alien-war/id6739988487/reviews) |
| Number of ratings | 6 | **85** |
| Positive reviews | **100.0% of reviews** | 94.1% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 4 MB | 466 MB |
| Requires iOS | **14.3** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 9+ |
| Developer | [Omar Fahmy](https://appshunter.io/developer/1512598159) | [Gcenter](https://appshunter.io/developer/1473786034) |

## What reviewers say

### Zero Below Zero

[App page](https://appshunter.io/ios/app/zero-below-zero/id1512598160)

A challenging puzzle game with simple mechanics but extreme difficulty. Achieve a perfect score on free levels to unlock the rest at no cost. No hints are provided, requiring strategic thinking to solve each unique circle-based puzzle.

**Highlights:** Extremely challenging gameplay, Unique circle-based puzzles, Free levels unlockable, No hints provided, Inspired by math puzzles

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all levels | $3.99 | one-time |


### Universe Invader 2

[App page](https://appshunter.io/ios/app/universe-invader-2-alien-war/id6739988487)

Embark on an epic space adventure to defend the galaxy from an alien invasion. This arcade shooter combines classic gameplay with stunning modern graphics, intense battles, and challenging boss fights. Collect power-ups and unlock achievements as you fight to save the universe.

**Highlights:** Stunning galaxy graphics, Intense alien battles, Epic boss fights, Collect power-ups and bonuses, Unlock achievements and rewards

**Features:** macOS Compatibility

**In-app purchases (43)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Bundle Vip 4 | $0.99 | one-time |
| Lucky Clover's Offer 1 | $0.99 | one-time |
| Bundle Vip 2 | $0.99 | one-time |
| Bundle Vip 1 | $0.99 | one-time |
| Starter Pack | $0.99 | one-time |
| Ruby 2 | $1.99 | one-time |
| Premium Starter | $1.99 | one-time |
| Instant Rank Up 2 | $1.99 | one-time |
| Ruby Offer 1 | $1.99 | one-time |
| Endless Item Pass | $2.99 | one-time |
| Fighter Trion Launch Discount | $2.99 | one-time |
| Fighter K-oni Launch Discount | $2.99 | one-time |
| Ruby Offer 4 | $3.99 | one-time |
| Ruby Offer 2 | $4.49 | one-time |
| Unlock Hunt Advanced Pass | $4.99 | one-time |
| Gold 3 | $4.99 | one-time |
| Ruby 3 | $4.99 | one-time |
| Combo Ruby And Gold | $4.99 | one-time |
| Instant Rank Up 3 | $4.99 | one-time |
| War Machine 5 | $4.99 | one-time |
| War Machine 2 | $4.99 | one-time |
| War Machine 3 | $4.99 | one-time |
| Ruby Offer 3 | $5.99 | one-time |
| Galactic Ruler 1 | $9.99 | one-time |
| Combo SS Devices | $9.99 | one-time |
| Ruby Offer 5 | $9.99 | one-time |
| Instant Rank Up 5 | $9.99 | one-time |
| Abyss Void Launch Discount | $9.99 | one-time |
| Galactic Ruler 4 | $9.99 | one-time |
| Galactic Ruler 5 | $9.99 | one-time |
| Galactic Ruler 8 | $9.99 | one-time |
| Ruby Offer 6 | $11.99 | one-time |
| Instant Rank Up 6 | $11.99 | one-time |
| Scorpio VI - Unlock | $12.99 | one-time |
| Instant Rank Up 7 | $14.99 | one-time |
| Dream Team | $19.99 | one-time |
| Abyss Void - Unlock | $19.99 | one-time |
| Instant Rank Up 9 | $24.99 | one-time |
| Instant Rank Up 10 | $29.99 | one-time |
| Bundle Vip 9 | $49.99 | one-time |
| Bundle Vip 13 | $99.99 | one-time |
| Bundle Vip 14 | $99.99 | one-time |
| Bundle Vip 20 | $99.99 | one-time |


## Frequently asked questions

### Is Zero Below Zero free?

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

### Is Universe Invader 2 free?

Universe Invader 2 is free to download, with in-app purchases available.

### Which has better reviews, Zero Below Zero or Universe Invader 2?

Zero Below Zero is rated higher. Zero Below Zero averages 5.0 out of 5 from 6 ratings, while Universe Invader 2 averages 4.8 from 85 ratings.

### Do Zero Below Zero or Universe Invader 2 have ads?

Universe Invader 2 shows ads; Zero Below Zero does not.

### Which is updated more often, Zero Below Zero or Universe Invader 2?

Zero Below Zero ships an update every 6 months, and Universe Invader 2 every 5 weeks. Most recently, Zero Below Zero was updated on September 30, 2026 and Universe Invader 2 on October 10, 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.*