# 安信盾 vs PDF快速盖章

The clearest difference is price: 安信盾 at Free against PDF快速盖章's $4.99. 安信盾 also leads on update cadence (every 2 months vs every 4 months) and device support (3 vs 1). On ads and in-app purchases there is nothing between them.

安信盾 is free to download; PDF快速盖章 costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

安信盾 ships an update every 2 months, PDF快速盖章 every 4 months. The most recent releases landed on September 17, 2026 and September 1, 2026 respectively.

## The numbers

| Metric | 安信盾 | PDF快速盖章 |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | — | Paid |
| Size | 34 MB | 27 MB |
| Requires iOS | **9.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Anhui Certificate Authority CO.LTD](https://appshunter.io/developer/1297167819) | [海昕 顾](https://appshunter.io/developer/606670314) |

## What reviewers say

### 安信盾

[App page](https://appshunter.io/ios/app/id1555183514)

**Features:** macOS Compatibility

**In-app purchases:** none


### PDF快速盖章

[App page](https://appshunter.io/ios/app/pdf/id6756157531)

This app allows for quick and easy stamping of PDF documents and images. It supports batch processing for multi-page PDFs, offers a comprehensive stamp library with customization options, and simulates realistic stamp effects. It's designed for efficient mobile document signing and processing.

**Highlights:** Quick stamping for PDFs and images, Batch processing for multi-page PDFs, Customizable stamp library, Realistic stamp effects with aging, Precise stamp adjustment, One-click common stamp setup, Direct opening from external apps

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 安信盾 free?

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

### Is PDF快速盖章 free?

PDF快速盖章 costs $4.99, with no in-app purchases.

### Do 安信盾 or PDF快速盖章 have ads?

Neither 安信盾 nor PDF快速盖章 shows ads.

### Which is updated more often, 安信盾 or PDF快速盖章?

安信盾 ships an update every 2 months, and PDF快速盖章 every 4 months. Most recently, 安信盾 was updated on September 17, 2026 and PDF快速盖章 on September 1, 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.*