# javaScriptCoding vs 文件预览助手

The clearest difference is update cadence: 文件预览助手 at every 2 weeks against javaScriptCoding's every 3 months. 文件预览助手 also leads on iOS requirement (13.0 vs 18.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

javaScriptCoding ships an update every 3 months, 文件预览助手 every 2 weeks. The most recent releases landed on October 7, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | javaScriptCoding | 文件预览助手 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Size | 9 MB | 56 MB |
| Requires iOS | 18.2 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [梦雨 朱](https://appshunter.io/developer/1854783354) | [北京创效未来](https://appshunter.io/developer/1714229626) |

## What reviewers say

### javaScriptCoding

[App page](https://appshunter.io/ios/app/javascriptcoding/id6756481453)

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

**In-app purchases:** none


### 文件预览助手

[App page](https://appshunter.io/ios/app/120-plus/id6761652430)

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

**In-app purchases:** none


## Frequently asked questions

### Is javaScriptCoding free?

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

### Is 文件预览助手 free?

文件预览助手 is free to download, with no in-app purchases.

### Do javaScriptCoding or 文件预览助手 have ads?

Neither javaScriptCoding nor 文件预览助手 shows ads.

### Which is updated more often, javaScriptCoding or 文件预览助手?

javaScriptCoding ships an update every 3 months, and 文件预览助手 every 2 weeks. Most recently, javaScriptCoding was updated on October 7, 2026 and 文件预览助手 on October 8, 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.*