# MP3转换助手 vs VIN码查询助手

The clearest difference is in-app purchases: VIN码查询助手 at none against MP3转换助手's 5. MP3转换助手's advantage is update cadence (every 3 days vs every 2 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. MP3转换助手 sells 5 in-app purchases, starting at $2.99 per 7 days. VIN码查询助手 asks for nothing beyond the download.

MP3转换助手 ships an update every 3 days, VIN码查询助手 every 2 weeks. The most recent releases landed on September 26, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | MP3转换助手 | VIN码查询助手 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 2 weeks |
| Size | 127 MB | 23 MB |
| Requires iOS | **15** | 16.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [文君 豆](https://appshunter.io/developer/1638750199) | [祯静 毛](https://appshunter.io/developer/1783564560) |

## What reviewers say

### MP3转换助手

[App page](https://appshunter.io/ios/app/mp3-and/id6788697028)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 周订阅-前3天试用 | $2.99 | per 7 days |
| 周订阅-首期折扣 | $2.99 | per 7 days |
| 周订阅 | $2.99 | per 7 days |
| 月订阅 | $4.99 | per month |
| 年订阅 | $14.99 | per year |


### VIN码查询助手

[App page](https://appshunter.io/ios/app/vin/id6798237857)

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

**In-app purchases:** none


## Frequently asked questions

### Is MP3转换助手 free?

MP3转换助手 is free to download, with in-app purchases available.

### Is VIN码查询助手 free?

VIN码查询助手 is free to download, with no in-app purchases.

### Do MP3转换助手 or VIN码查询助手 have ads?

Neither MP3转换助手 nor VIN码查询助手 shows ads.

### Which is updated more often, MP3转换助手 or VIN码查询助手?

MP3转换助手 ships an update every 3 days, and VIN码查询助手 every 2 weeks. Most recently, MP3转换助手 was updated on September 26, 2026 and VIN码查询助手 on October 8, 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.*