# Dux Mobility vs Sign PDF Documents

The clearest difference is in-app purchases: Dux Mobility at none against Sign PDF Documents's 6. Dux Mobility also leads on iOS requirement (9.0 vs 17.0). Sign PDF Documents's advantage is update cadence (every 3 weeks vs every 8 months). On price, ads and device support there is nothing between them.

Both are free to download. Sign PDF Documents sells 6 in-app purchases, starting at $4.99 per 7 days. Dux Mobility asks for nothing beyond the download.

Dux Mobility ships an update every 8 months, Sign PDF Documents every 3 weeks. The most recent releases landed on September 9, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Dux Mobility | Sign PDF Documents |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.9 (55 ratings)](https://appshunter.io/ios/app/sign-pdf-documents-esign-app/id1661630551/reviews)** |
| Number of ratings | — | **55** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 3 weeks** |
| Monetization | — | Freemium |
| Size | 125 MB | 89 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Mainpac Pty Ltd](https://appshunter.io/developer/1282792477) | [NextPixel apps](https://appshunter.io/developer/1584487280) |

## What reviewers say

### Dux Mobility

[App page](https://appshunter.io/ios/app/dux-mobility/id1551768116)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sign PDF Documents

[App page](https://appshunter.io/ios/app/sign-pdf-documents-esign-app/id1661630551)

Easily sign documents like PDFs and other files directly from your device. Scan, capture, or create custom signatures to apply to your files. Manage and share all your signed documents with this offline app.

**Highlights:** Sign documents from files, Sign documents from iCloud, Sign documents from photos, Scan and sign documents, Create and capture signatures, Edit PDFs with signatures, Share signed documents, Manage signed documents

**Features:** macOS Compatibility, Apple Watch app, iMessage stickers, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDF Signature weekly plan | $4.99 | per 7 days |
| Sign PDF Documents with Esign | $4.99 | per 7 days |
| Sign PDF Documents with Esign | $5.99 | per 7 days |
| E-signature documents & PDF | $6.99 | per 7 days |
| Document sign now - Monthly | $7.99 | per month |
| PDF Signature - eSign App | $9.99 | per month |


## Frequently asked questions

### Is Dux Mobility free?

Dux Mobility is free to download, with no in-app purchases.

### Is Sign PDF Documents free?

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

### Do Dux Mobility or Sign PDF Documents have ads?

Neither Dux Mobility nor Sign PDF Documents shows ads.

### Which is updated more often, Dux Mobility or Sign PDF Documents?

Dux Mobility ships an update every 8 months, and Sign PDF Documents every 3 weeks. Most recently, Dux Mobility was updated on September 9, 2026 and Sign PDF Documents 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.*