# Sky Force vs Brain Training 39 Cards

The clearest difference is in-app purchases: Brain Training 39 Cards at none against Sky Force's 4. Brain Training 39 Cards also leads on ads (none vs shown). Sky Force's advantage is iOS requirement (15.0 vs 17.0). On price and device support there is nothing between them.

Both are free to download. Sky Force sells 4 one-off in-app purchases. Brain Training 39 Cards asks for nothing beyond the download.

## The numbers

| Metric | Sky Force | Brain Training 39 Cards |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (2.1K ratings)](https://appshunter.io/ios/app/sky-force/id717233547/reviews)** | — |
| Number of ratings | **2.1K** | — |
| Positive reviews | 89.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 260 MB | 4 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Infinite Dreams Inc.](https://appshunter.io/developer/306712040) | [亚枫 何](https://appshunter.io/developer/1896403537) |

## What reviewers say

### Sky Force

[App page](https://appshunter.io/ios/app/sky-force/id717233547)

Experience a classic arcade shooter reborn with stunning 3D graphics and intuitive touch controls. Upgrade your ship, battle intense bosses, and compete in weekly tournaments against other players. Rescue fallen pilots for rewards and achieve victory in this action-packed scrolling shooter.

**Highlights:** Stunning 3D graphics, Intuitive touchscreen controls, Powerful ship upgrade system, Weekly player tournaments, Rescue fallen pilots for rewards, Multiple boss battles, In-game achievements

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Precious Cargo | $1.99 | one-time |
| Ads Removal | $3.99 | one-time |
| Plane Generator | $3.99 | one-time |
| SX2 - Star Doubler | $3.99 | one-time |

**What reviewers like**

- 🚀 Smooth gameplay
- 👍 Great graphics and sound
- 💎 Challenging but rewarding
- 🎮 Classic arcade-style shooter
- 🔋 Offline playable

**What reviewers complain about**

- 🐛 Crashes and performance issues
- ⏱️ Slow progression and long upgrade times
- 💰 Grindy to progress without in-app purchases
- 👎 Controls can be frustrating on mobile

**Reported bugs**

- Game crashes on launch for some users
- Saved progress not syncing across devices
- Ads not working as expected

**Requested features**

- More levels and content updates
- Controller support
- Ability to reset progress
- Customization options for the ship


### Brain Training 39 Cards

[App page](https://appshunter.io/ios/app/brain-training-39-cards/id6774496871)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sky Force free?

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

### Is Brain Training 39 Cards free?

Brain Training 39 Cards is free to download, with no in-app purchases.

### Do Sky Force or Brain Training 39 Cards have ads?

Sky Force shows ads; Brain Training 39 Cards 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.*