# 信噪 vs PDF Editor

The clearest difference is ads: 信噪 at none against PDF Editor's shown. PDF Editor's advantage is device support (3 vs 1). On price, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. 信噪 sells 1 one-off in-app purchase and PDF Editor sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | 信噪 | PDF Editor |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | — | Monthly |
| Size | 3 MB | 11 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | **iPhone, iPad, Mac** |
| Age rating | 4+ | +4 |
| Developer | [通 庞](https://appshunter.io/developer/1896779481) | [Arima Jain](https://appshunter.io/developer/1679158070) |

## What reviewers say

### 信噪

[App page](https://appshunter.io/ios/app/id6772231085)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 信号 Pro | $2.99 | one-time |


### PDF Editor

[App page](https://appshunter.io/ios/app/pdf-editor-document-assistant/id6789095581)

**Features:** Family Sharing, Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock All Features | $3.99 | one-time |


## Frequently asked questions

### Is 信噪 free?

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

### Is PDF Editor free?

PDF Editor is free to download, with in-app purchases available.

### Do 信噪 or PDF Editor have ads?

PDF Editor shows ads; 信噪 does not.

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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.*