# 139邮箱 vs 格式转换

The clearest difference is review sentiment: 139邮箱 at 86% against 格式转换's 38%. 139邮箱 also leads on in-app purchases (none vs 4) and ads (none vs shown). 格式转换's advantage is rating (5.0 vs 4.6). On price, device support and iOS requirement there is nothing between them.

Both are free to download. 格式转换 sells 4 one-off in-app purchases. 139邮箱 asks for nothing beyond the download.

格式转换 holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: 139邮箱 has 107 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 86% of 139邮箱's written reviews are positive against 38% of 格式转换's, so the app with the better star average is not the one people write more warmly about.

139邮箱 ships an update monthly, 格式转换 every 4 months. The most recent releases landed on November 10, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | 139邮箱 | 格式转换 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (107 ratings)](https://appshunter.io/ios/app/139/id474433226/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/pdf/id1592081958/reviews)** |
| Number of ratings | **107** | 3 |
| Positive reviews | **86.1% of reviews** | 37.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 4 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 189 MB | 81 MB |
| Requires iOS | **14.0** | 15 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [China Mobile Internet Company Limited](https://appshunter.io/developer/1612019289) | [强 孙](https://appshunter.io/developer/1469862200) |

## What reviewers say

### 139邮箱

[App page](https://appshunter.io/ios/app/139/id474433226)

This app offers a comprehensive email and cloud storage solution, allowing users to send and receive emails, back up phone data, and utilize AI-powered tools for enhanced productivity. It provides secure cloud storage, voice-to-text notes, and convenient bill checking.

**Highlights:** Email and cloud storage integration, AI-powered writing and summarization, Secure cloud backup for files and photos, Voice-to-text note-taking, Multi-account email management, One-click passwordless login, Bill and invoice management

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

**In-app purchases:** none


### 格式转换

[App page](https://appshunter.io/ios/app/pdf/id1592081958)

This app offers a comprehensive suite of tools for converting and editing various file types, including audio, video, images, and PDF documents. It supports batch processing, lossless encoding, and watermark-free exports for a seamless user experience.

**Highlights:** Audio conversion and editing, Video conversion and editing, Image conversion and editing, PDF document conversion, Batch processing, Lossless encoding, Watermark-free export

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 周费 | $0.99 | one-time |
| 月费 | $1.99 | one-time |
| 季费 | $3.99 | one-time |
| 年费 | $6.99 | one-time |


## Frequently asked questions

### Is 139邮箱 free?

139邮箱 is free to download, with no in-app purchases.

### Is 格式转换 free?

格式转换 is free to download, with in-app purchases available.

### Which has better reviews, 139邮箱 or 格式转换?

格式转换 is rated higher. 139邮箱 averages 4.6 out of 5 from 107 ratings, while 格式转换 averages 5.0 from 3 ratings.

### Do 139邮箱 or 格式转换 have ads?

格式转换 shows ads; 139邮箱 does not.

### Which is updated more often, 139邮箱 or 格式转换?

139邮箱 ships an update monthly, and 格式转换 every 4 months. Most recently, 139邮箱 was updated on November 10, 2026 and 格式转换 on November 13, 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.*