# NAS Chat Center vs Sign Documents

The clearest difference is in-app purchases: NAS Chat Center at none against Sign Documents's 5. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Sign Documents sells 5 in-app purchases, starting at $4.99 per 7 days. NAS Chat Center asks for nothing beyond the download.

NAS Chat Center ships an update every 4 days, Sign Documents weekly. The most recent releases landed on September 10, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | NAS Chat Center | Sign Documents |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (152 ratings)](https://appshunter.io/ios/app/sign-documents-esign-pdf/id6502787198/reviews)** |
| Number of ratings | — | **152** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Weekly |
| Monetization | — | Free with in-app purchases |
| Size | 14 MB | 33 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | +4 |
| Developer | [New Age S.A.](https://appshunter.io/developer/1656471856) | [Julia Kucharska](https://appshunter.io/developer/1747807368) |

## What reviewers say

### NAS Chat Center

[App page](https://appshunter.io/ios/app/nas-chat-center/id6445855626)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sign Documents

[App page](https://appshunter.io/ios/app/sign-documents-esign-pdf/id6502787198)

Easily sign and manage your documents with a built-in scanner. Digitize paper, add signatures and stamps, and share your finalized files. Supports various document types for a streamlined workflow.

**Highlights:** Add digital signatures, Insert stamps, Scan documents, Create documents from photos, Sign PDF, DOC, XLS, Share and print documents

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly PRO | $4.99 | per 7 days |
| Weekly PRO Subscription | $4.99 | per 7 days |
| Weekly Premium | $9.99 | per 7 days |
| Annual PRO | $29.99 | per year |
| Annual Premium | $49.99 | per year |


## Frequently asked questions

### Is NAS Chat Center free?

NAS Chat Center is free to download, with no in-app purchases.

### Is Sign Documents free?

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

### Do NAS Chat Center or Sign Documents have ads?

Neither NAS Chat Center nor Sign Documents shows ads.

### Which is updated more often, NAS Chat Center or Sign Documents?

NAS Chat Center ships an update every 4 days, and Sign Documents weekly. Most recently, NAS Chat Center was updated on September 10, 2026 and Sign Documents on September 23, 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.*