# 签章助手 vs Stamp Designer

The clearest difference is in-app purchases: Stamp Designer at none against 签章助手's 3. Stamp Designer also leads on update cadence (weekly vs monthly) and iOS requirement (15.0 vs 17.0). On price, review sentiment, ads and monetization model there is nothing between them.

Both are free to download. 签章助手 sells 3 in-app purchases, starting at $3.99 per 7 days. Stamp Designer asks for nothing beyond the download.

签章助手 ships an update monthly, Stamp Designer weekly. The most recent releases landed on September 3, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | 签章助手 | Stamp Designer |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 78 MB | 100 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [家芳 陶](https://appshunter.io/developer/1891660721) | [秀文 石](https://appshunter.io/developer/1896738759) |

## What reviewers say

### 签章助手

[App page](https://appshunter.io/ios/app/pdf/id6762083508)

This tool allows users to easily add stamps and signatures to PDF documents. It supports various stamp types, including contract and cross-page seals, and allows for flexible placement and resizing. Once applied, stamps and signatures are permanently embedded into the PDF for secure sharing and archiving.

**Highlights:** Add stamps and signatures to PDFs, Supports contract and cross-page seals, Drag, rotate, and resize elements, Multi-page document processing, Embeds stamps/signatures into exported PDFs, Local storage for security

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 7-day VIP (unlock all) | $3.99 | per 7 days |
| 7days | $3.99 | one-time |
| lifetime | $19.99 | one-time |


### Stamp Designer

[App page](https://appshunter.io/ios/app/stamp-designer-pdf-e-stamps/id6770826891)

Design custom stamps for personal use on images and documents. Add text, colors, borders, and graphic elements to create unique stamp styles. Easily apply stamps to photos, PDFs, and share your creations.

**Highlights:** Custom stamp style design, Text, color, and border customization, Image cutout, Apply stamps to images, Add stamps to PDF documents, Save and share creations

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

**In-app purchases:** none


## Frequently asked questions

### Is 签章助手 free?

签章助手 is free to download, with in-app purchases available.

### Is Stamp Designer free?

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

### Do 签章助手 or Stamp Designer have ads?

Neither 签章助手 nor Stamp Designer shows ads.

### Which is updated more often, 签章助手 or Stamp Designer?

签章助手 ships an update monthly, and Stamp Designer weekly. Most recently, 签章助手 was updated on September 3, 2026 and Stamp Designer on September 10, 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.*