# Sublux vs 回线：BACKTRACE

The clearest difference is ads: 回线：BACKTRACE at none against Sublux's shown. Sublux's advantage is iOS requirement (13.0 vs 15.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Sublux | 回线：BACKTRACE |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Weekly | — |
| Size | 80 MB | 4 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 12+ |
| Developer | [Taehyung Kim](https://appshunter.io/developer/1881270192) | [云扬 智](https://appshunter.io/developer/1891216245) |

## What reviewers say

### Sublux

[App page](https://appshunter.io/ios/app/sublux-survive-the-dark/id6759856509)

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

**In-app purchases:** none


### 回线：BACKTRACE

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

**In-app purchases:** none


## Frequently asked questions

### Is Sublux free?

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

### Is 回线：BACKTRACE free?

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

### Do Sublux or 回线：BACKTRACE have ads?

Sublux shows ads; 回线：BACKTRACE 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.*