# 回线：BACKTRACE vs Vein

The clearest difference is ads: 回线：BACKTRACE at none against Vein's shown. 回线：BACKTRACE also leads on iOS requirement (15.0 vs 17.0). 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 | 回线：BACKTRACE | Vein |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | — | Daily |
| Size | 4 MB | 203 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 12+ |
| Developer | [云扬 智](https://appshunter.io/developer/1891216245) | [Hiroyuki Sonozuka](https://appshunter.io/developer/1528423565) |

## What reviewers say

### 回线：BACKTRACE

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

**In-app purchases:** none


### Vein

[App page](https://appshunter.io/ios/app/vein-dungeon-ecosystem/id6799141706)

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

**In-app purchases:** none


## Frequently asked questions

### Is 回线：BACKTRACE free?

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

### Is Vein free?

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

### Do 回线：BACKTRACE or Vein have ads?

Vein 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.*