# Sync vs Alien Defense

The clearest difference is price: Alien Defense at Free against Sync's $0.99. Alien Defense also leads on update cadence (every 3 weeks vs every 40 months). Sync's advantage is ads (none vs shown) and iOS requirement (12.0 vs 15.0). On in-app purchases and device support there is nothing between them.

Alien Defense is free to download; Sync costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Sync ships an update every 40 months, Alien Defense every 3 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | Sync | Alien Defense |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.8 (33 ratings)](https://appshunter.io/ios/app/sync-ball/id356277312/reviews)** | — |
| Number of ratings | **33** | — |
| Positive reviews | 96.8% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 40 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 9 MB | 263 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Tozai, Inc.](https://appshunter.io/developer/356277315) | [PLAYGENIX EDTECH INC.](https://appshunter.io/developer/6784856448) |

## What reviewers say

### Sync

[App page](https://appshunter.io/ios/app/sync-ball/id356277312)

Engage your mind with a unique puzzle experience where you guide synchronized balls to designated holes using simple swipes. Navigate through increasingly complex mazes, strategically using walls to achieve your goals. Enjoy a tranquil yet stimulating challenge with 80 levels, designed for thoughtful problem-solving without time pressure.

**Highlights:** Swipe to move synchronized balls, Align balls into holes, Use maze walls for strategy, Avoid falling off the platform, Progress through 80 levels, No time limits or scores, Develop concentration and problem-solving skills

**Features:** macOS Compatibility

**In-app purchases:** none


### Alien Defense

[App page](https://appshunter.io/ios/app/alien-defense-space-tower-rts/id6776451528)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sync free?

Sync costs $0.99, with no in-app purchases.

### Is Alien Defense free?

Alien Defense is free to download, with no in-app purchases.

### Do Sync or Alien Defense have ads?

Alien Defense shows ads; Sync does not.

### Which is updated more often, Sync or Alien Defense?

Sync ships an update every 40 months, and Alien Defense every 3 weeks. Most recently, Sync was updated on October 24, 2026 and Alien Defense on October 24, 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.*