# 闪电PDF转换 vs MP3转换助手

The clearest difference is update cadence: MP3转换助手 at every 3 days against 闪电PDF转换's every 6 weeks. 闪电PDF转换's advantage is iOS requirement (11.0 vs 15). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 闪电PDF转换 sells 4 in-app purchases, starting at $3.99 per month and MP3转换助手 sells 5 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

闪电PDF转换 ships an update every 6 weeks, MP3转换助手 every 3 days. The most recent releases landed on October 16, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | 闪电PDF转换 | MP3转换助手 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 days** |
| Size | 94 MB | 127 MB |
| Requires iOS | **11.0** | 15 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [丽琼 邓](https://appshunter.io/developer/1702793856) | [文君 豆](https://appshunter.io/developer/1638750199) |

## What reviewers say

### 闪电PDF转换

[App page](https://appshunter.io/ios/app/pdf-pdfpdf/id1618181802)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 一个月会员套餐 | $3.99 | per month |
| 六个月会员 | $8.99 | per 6 months |
| 一年会员 | $10.99 | per year |
| 永久会员 | $27.99 | one-time |


### 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 |


## Frequently asked questions

### Is 闪电PDF转换 free?

闪电PDF转换 is free to download, with in-app purchases available.

### Is MP3转换助手 free?

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

### Do 闪电PDF转换 or MP3转换助手 have ads?

Neither 闪电PDF转换 nor MP3转换助手 shows ads.

### Which is updated more often, 闪电PDF转换 or MP3转换助手?

闪电PDF转换 ships an update every 6 weeks, and MP3转换助手 every 3 days. Most recently, 闪电PDF转换 was updated on October 16, 2026 and MP3转换助手 on October 12, 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.*