# 录音机 vs PDF转换器

录音机 and PDF转换器 are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. 录音机 sells 3 in-app purchases, starting at $2.99 per 7 days and PDF转换器 sells 2 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

录音机 ships an update every 4 days, PDF转换器 every 3 days. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | 录音机 | PDF转换器 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 days | **Every 3 days** |
| Size | 35 MB | 8 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [刚 唐](https://appshunter.io/developer/1828084566) | [Ming Fai Lee](https://appshunter.io/developer/1691484255) |

## What reviewers say

### 录音机

[App page](https://appshunter.io/ios/app/id6755291357)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 专业手机录音机限时特惠周会员 | $2.99 | per 7 days |
| 专业手机录音机限时特惠月会员 | $4.99 | per month |
| 专业手机录音机限时特惠年会员 | $24.99 | per year |


### PDF转换器

[App page](https://appshunter.io/ios/app/pdf-pdf/id6755513544)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF转换器周会员 | $2.99 | per 7 days |
| PDF转换器年会员 | $24.99 | per year |


## Frequently asked questions

### Is 录音机 free?

录音机 is free to download, with in-app purchases available.

### Is PDF转换器 free?

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

### Do 录音机 or PDF转换器 have ads?

Neither 录音机 nor PDF转换器 shows ads.

### Which is updated more often, 录音机 or PDF转换器?

录音机 ships an update every 4 days, and PDF转换器 every 3 days. Most recently, 录音机 was updated on October 24, 2026 and PDF转换器 on October 28, 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.*