# Alien Fortress vs 回线：BACKTRACE

The clearest difference is in-app purchases: 回线：BACKTRACE at none against Alien Fortress's 10. Alien Fortress's advantage is iOS requirement (12.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Alien Fortress sells 10 one-off in-app purchases. 回线：BACKTRACE asks for nothing beyond the download.

## The numbers

| Metric | Alien Fortress | 回线：BACKTRACE |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/alien-fortress-bounty-hunter/id6443552084/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 95.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | — |
| Monetization | Free | — |
| Size | 592 MB | 4 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 12+ |
| Developer | [Xinline Information Technology Co., Ltd](https://appshunter.io/developer/514191600) | [云扬 智](https://appshunter.io/developer/1891216245) |

## What reviewers say

### Alien Fortress

[App page](https://appshunter.io/ios/app/alien-fortress-bounty-hunter/id6443552084)

Engage in a thrilling intergalactic adventure combining shooting, roguelike dungeons, and strategic base defense. Customize mechs and operators, battle alien monsters, and explore diverse planets to save Earth.

**Highlights:** Shooting and bullet hell gameplay, Randomized dungeon exploration, Tower defense and strategy modes, Mech and operator customization, Vehicle co-op combat, Multiple game modes including endless and real-time strategy

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 180 Kryptonite | $2.99 | one-time |
| Kryptonite Extractor + 300 | $3.99 | one-time |
| Supply Pack 04 | $5.99 | one-time |
| 680 Kryptonite | $9.99 | one-time |
| Supply Pack 05 | $14.99 | one-time |
| 1280 Kryptonite | $19.99 | one-time |
| Supply Pack 06 | $29.99 | one-time |
| 3280 Kryptonite | $49.99 | one-time |
| Zeus Shield Pack | $59.99 | one-time |
| 6480 Kryptonite | $99.99 | one-time |


### 回线：BACKTRACE

[App page](https://appshunter.io/ios/app/backtrace/id6797782656)

**In-app purchases:** none


## Frequently asked questions

### Is Alien Fortress free?

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

### Is 回线：BACKTRACE free?

回线：BACKTRACE is free to download, with no in-app purchases.

### Do Alien Fortress or 回线：BACKTRACE have ads?

Neither Alien Fortress nor 回线：BACKTRACE shows ads.

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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.*