# 139邮箱 vs 格式转换器

The clearest difference is in-app purchases: 139邮箱 at none against 格式转换器's 3. 139邮箱 also leads on ratings volume (106 vs 3). 格式转换器's advantage is rating (5.0 vs 4.6) and iOS requirement (12.0 vs 14.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. 格式转换器 sells 3 in-app purchases, starting at $2.99 per month. 139邮箱 asks for nothing beyond the download.

格式转换器 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 106 ratings behind it against 3, so its average is the more settled of the two.

139邮箱 ships an update monthly, 格式转换器 every 3 weeks. The most recent releases landed on November 1, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 139邮箱 | 格式转换器 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (106 ratings)](https://appshunter.io/ios/app/139/id474433226/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/id6461724362/reviews)** |
| Number of ratings | **106** | 3 |
| Positive reviews | 86.1% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | **Free** | Freemium |
| Size | 189 MB | 29 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [China Mobile Internet Company Limited](https://appshunter.io/developer/1612019289) | [Jiujiu Service Co., Ltd.](https://appshunter.io/developer/1664391586) |

## 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


### 格式转换器

[App page](https://appshunter.io/ios/app/id6461724362)

Convert videos, audio, images, and documents between various formats. Offers powerful conversion tools for all your file needs. Subscription options available for advanced features.

**Highlights:** Video format conversion (MP4, MOV, AVI, FLV), Audio format conversion (MP3, AAC, WAV), Image format conversion (PNG, JPEG, BMP), Document format conversion (Word, Excel, PDF), Subscription for advanced features

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 月会员 | $2.99 | per month |
| 年会员 | $9.99 | per year |
| 永久会员 | $14.99 | one-time |


## Frequently asked questions

### Is 139邮箱 free?

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

### Is 格式转换器 free?

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

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

格式转换器 is rated higher. 139邮箱 averages 4.6 out of 5 from 106 ratings, while 格式转换器 averages 5.0 from 3 ratings.

### Do 139邮箱 or 格式转换器 have ads?

Neither 139邮箱 nor 格式转换器 shows ads.

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

139邮箱 ships an update monthly, and 格式转换器 every 3 weeks. Most recently, 139邮箱 was updated on November 1, 2026 and 格式转换器 on October 24, 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.*