# Document Signer vs PDF AI

The clearest difference is ads: Document Signer at none against PDF AI's shown. Document Signer also leads on update cadence (every 9 days vs every 3 weeks). PDF AI's advantage is review sentiment (90% vs 75%) and ratings volume (151 vs 26). On price, rating, in-app purchases and monetization model there is nothing between them.

Both are free to download. Document Signer sells 4 in-app purchases, starting at $4.99 per 7 days and PDF AI sells 5 in-app purchases, starting at $7.99 per 7 days. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for Document Signer against 4.8 for PDF AI. That said, the two scores are not equally well evidenced: PDF AI has 151 ratings behind it against 26, so its average is the more settled of the two. Written reviews are what separate them: 75% of Document Signer's written reviews are positive against 90% of PDF AI's.

Document Signer ships an update every 9 days, PDF AI every 3 weeks. The most recent releases landed on August 14, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Document Signer | PDF AI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (26 ratings)](https://appshunter.io/ios/app/document-signer-simplesign/id6502412936/reviews) | **[4.8 (151 ratings)](https://appshunter.io/ios/app/pdf-ai-editor-scanner-chat/id6581489325/reviews)** |
| Number of ratings | 26 | **151** |
| Positive reviews | 75.0% of reviews | **90.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 9 days** | Every 3 weeks |
| Monetization | Freemium | Free with in-app purchases |
| Size | 47 MB | 169 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Zion Studios LLC](https://appshunter.io/developer/1685918923) | [Yang Yang](https://appshunter.io/developer/1756128958) |

## What reviewers say

### Document Signer

[App page](https://appshunter.io/ios/app/document-signer-simplesign/id6502412936)

Easily sign PDFs, fill forms, and manage scanned documents. This app offers a free e-signature feature and a camera scanner. Upgrade to Pro for advanced editing tools, templates, and cloud syncing.

**Highlights:** Electronic document signing, PDF and image file signing, Camera scanner for documents, Document editing tools, Ready-to-use templates, Google Drive syncing, Local storage for privacy

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly Subscription | $4.99 | per 7 days |
| Pro Monthly Subscription | $12.99 | per month |
| Pro Yearly Subscription | $59.99 | per year |
| Lifetime SimpleSign Offer | $69.99 | one-time |


### PDF AI

[App page](https://appshunter.io/ios/app/pdf-ai-editor-scanner-chat/id6581489325)

This application offers a comprehensive suite of AI-powered tools for managing PDF documents. Users can edit text and images, generate AI summaries, convert files to various formats, and securely sign documents. It prioritizes speed and privacy with local processing and encryption.

**Highlights:** Edit PDF text and images, AI-powered summaries and highlights, Annotate and collaborate on documents, Fill and e-sign forms, Convert PDFs to Word, Excel, PPT, Images, TXT, Secure offline scanning and organization

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly VIP | $7.99 | per 7 days |
| Weekly VIP | $9.99 | per 7 days |
| Weekly VIP | $9.99 | per 7 days |
| Monthly VIP | $14.99 | per month |
| Yearly VIP | $59.99 | per year |


## Frequently asked questions

### Is Document Signer free?

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

### Is PDF AI free?

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

### Which has better reviews, Document Signer or PDF AI?

PDF AI is rated higher. Document Signer averages 4.7 out of 5 from 26 ratings, while PDF AI averages 4.8 from 151 ratings.

### Do Document Signer or PDF AI have ads?

PDF AI shows ads; Document Signer does not.

### Which is updated more often, Document Signer or PDF AI?

Document Signer ships an update every 9 days, and PDF AI every 3 weeks. Most recently, Document Signer was updated on August 14, 2026 and PDF AI on September 20, 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.*