# 闪电PDF转换 vs Speak Comments

The clearest difference is update cadence: Speak Comments at every 9 days against 闪电PDF转换's every 6 weeks. 闪电PDF转换's advantage is iOS requirement (11.0 vs 17.6). 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 Speak Comments sells 1 in-app purchase, starting at $0.39 per month. Whichever you choose, the download price is not the number that matters.

闪电PDF转换 ships an update every 6 weeks, Speak Comments every 9 days. The most recent releases landed on September 13, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | 闪电PDF转换 | Speak Comments |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/speak-comments/id6740336884/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 9 days** |
| Monetization | — | Free with in-app purchases |
| Size | 94 MB | 4 MB |
| Requires iOS | **11.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [丽琼 邓](https://appshunter.io/developer/1702793856) | [林勇 纪](https://appshunter.io/developer/1783739084) |

## 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 |


### Speak Comments

[App page](https://appshunter.io/ios/app/speak-comments/id6740336884)

This app reads aloud comments from platforms like Twitter (X), YouTube, and Zhihu. Simply share a post or video to the app, and it will vocalize the comments. It requires login for full access to content on X and Zhihu.

**Highlights:** Reads Twitter (X) comments aloud, Reads YouTube comments aloud, Reads Zhihu comments aloud, Share functionality for easy loading, In-app login for X and Zhihu, Supports iPhone and iPad

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Comments Reader | $0.39 | per month |


## 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 Speak Comments free?

Speak Comments is free to download, with in-app purchases available.

### Do 闪电PDF转换 or Speak Comments have ads?

Neither 闪电PDF转换 nor Speak Comments shows ads.

### Which is updated more often, 闪电PDF转换 or Speak Comments?

闪电PDF转换 ships an update every 6 weeks, and Speak Comments every 9 days. Most recently, 闪电PDF转换 was updated on September 13, 2026 and Speak Comments on September 20, 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.*