# 货架追踪 vs 单位转换器

The clearest difference is update cadence: 单位转换器 at every 2 days against 货架追踪's every 2 months. 单位转换器 also leads on device support. 货架追踪's advantage is iOS requirement (13.0 vs 16). On price and in-app purchases there is nothing between them.

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

货架追踪 ships an update every 2 months, 单位转换器 every 2 days. The most recent releases landed on October 25, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | 货架追踪 | 单位转换器 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | — | Yes |
| Update frequency | Every 2 months | **Every 2 days** |
| Size | 35 MB | 15 MB |
| Requires iOS | **13.0** | 16 |
| Devices | — | **iPhone, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [广州中远海运船舶技术工程有限公司](https://appshunter.io/developer/1601783464) | [志雄 黄](https://appshunter.io/developer/1877111087) |

## What reviewers say

### 货架追踪

[App page](https://appshunter.io/ios/app/id6499243708)

**In-app purchases:** none


### 单位转换器

[App page](https://appshunter.io/ios/app/id6759898332)

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

**In-app purchases:** none


## Frequently asked questions

### Is 货架追踪 free?

货架追踪 is free to download, with no in-app purchases.

### Is 单位转换器 free?

单位转换器 is free to download, with no in-app purchases.

### Which is updated more often, 货架追踪 or 单位转换器?

货架追踪 ships an update every 2 months, and 单位转换器 every 2 days. Most recently, 货架追踪 was updated on October 25, 2026 and 单位转换器 on October 19, 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.*