# Post Ai vs MyPDFSign

The clearest difference is in-app purchases: Post Ai at none against MyPDFSign's 1. Post Ai also leads on iOS requirement (12.0 vs 17.0). MyPDFSign's advantage is update cadence (monthly vs every 9 months). On price, ads and device support there is nothing between them.

Both are free to download. MyPDFSign sells 1 one-off in-app purchase. Post Ai asks for nothing beyond the download.

Post Ai ships an update every 9 months, MyPDFSign monthly. The most recent releases landed on October 4, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Post Ai | MyPDFSign |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/mypdfsign/id6762978607/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Monthly** |
| Monetization | — | Free with in-app purchases |
| Size | 62 MB | 3 MB |
| Requires iOS | **12.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Luis Mujica](https://appshunter.io/developer/1718482618) | [ScanPDF – All-in-One PDF Tool](https://appshunter.io/developer/1883137463) |

## What reviewers say

### Post Ai

[App page](https://appshunter.io/ios/app/post-ai-generate-posts/id6473136604)

**Features:** macOS Compatibility

**In-app purchases:** none


### MyPDFSign

[App page](https://appshunter.io/ios/app/mypdfsign/id6762978607)

Easily sign PDF documents with a clean and intuitive interface. This tool allows for quick signature application on forms, contracts, and business documents, with secure on-device processing and high-quality export.

**Highlights:** Sign PDF files quickly, Add signatures anytime, anywhere, Clean and easy-to-use interface, High-quality PDF export, Secure on-device processing, Works for forms and contracts

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Premium | $9.99 | one-time |


## Frequently asked questions

### Is Post Ai free?

Post Ai is free to download, with no in-app purchases.

### Is MyPDFSign free?

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

### Do Post Ai or MyPDFSign have ads?

Neither Post Ai nor MyPDFSign shows ads.

### Which is updated more often, Post Ai or MyPDFSign?

Post Ai ships an update every 9 months, and MyPDFSign monthly. Most recently, Post Ai was updated on October 4, 2026 and MyPDFSign on October 3, 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.*