# 灵心AI vs 签章助手

The clearest difference is in-app purchases: 灵心AI at none against 签章助手's 3. 灵心AI also leads on update cadence (every 2 days vs monthly) and iOS requirement (13.0 vs 17.0). On price, ads and device support 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. 灵心AI asks for nothing beyond the download.

灵心AI ships an update every 2 days, 签章助手 monthly. The most recent releases landed on October 16, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | 灵心AI | 签章助手 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Monthly |
| Monetization | — | Free with in-app purchases |
| Size | 134 MB | 78 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [康 姚](https://appshunter.io/developer/1870450739) | [家芳 陶](https://appshunter.io/developer/1891660721) |

## What reviewers say

### 灵心AI

[App page](https://appshunter.io/ios/app/ai/id6758072628)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is 灵心AI free?

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

### Is 签章助手 free?

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

### Do 灵心AI or 签章助手 have ads?

Neither 灵心AI nor 签章助手 shows ads.

### Which is updated more often, 灵心AI or 签章助手?

灵心AI ships an update every 2 days, and 签章助手 monthly. Most recently, 灵心AI was updated on October 16, 2026 and 签章助手 on October 4, 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.*