# 简之 vs 图片格式转换

The clearest difference is in-app purchases: 简之 at none against 图片格式转换's 3. 简之 also leads on ads (none vs shown) and iOS requirement (9.0 vs 16.0). 图片格式转换's advantage is update cadence (weekly vs every 3 weeks). On price and device support there is nothing between them.

Both are free to download. 图片格式转换 sells 3 in-app purchases, starting at $3.99 per month. 简之 asks for nothing beyond the download.

简之 ships an update every 3 weeks, 图片格式转换 weekly. The most recent releases landed on October 3, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | 简之 | 图片格式转换 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Weekly** |
| Size | 42 MB | 61 MB |
| Requires iOS | **9.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Chuangyin Network Technology Co., Ltd.](https://appshunter.io/developer/1468448099) | [子豪 张](https://appshunter.io/developer/1625809217) |

## What reviewers say

### 简之

[App page](https://appshunter.io/ios/app/id1468448100)

**Features:** macOS Compatibility

**In-app purchases:** none


### 图片格式转换

[App page](https://appshunter.io/ios/app/id6446273369)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Month Membership | $3.99 | per month |
| Season Membership | $9.99 | per 3 months |
| Year Membership | $19.99 | per year |


## Frequently asked questions

### Is 简之 free?

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

### Is 图片格式转换 free?

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

### Do 简之 or 图片格式转换 have ads?

图片格式转换 shows ads; 简之 does not.

### Which is updated more often, 简之 or 图片格式转换?

简之 ships an update every 3 weeks, and 图片格式转换 weekly. Most recently, 简之 was updated on October 3, 2026 and 图片格式转换 on September 14, 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.*