# Fast PDF Document Scanner App vs Khenix

The clearest difference is update cadence: Khenix at every 3 weeks against Fast PDF Document Scanner App's every 3 months. Fast PDF Document Scanner App's advantage is iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Fast PDF Document Scanner App sells 4 in-app purchases, starting at $2.99 per month and Khenix sells 6 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Fast PDF Document Scanner App ships an update every 3 months, Khenix every 3 weeks. The most recent releases landed on October 8, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Fast PDF Document Scanner App | Khenix |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Size | 118 MB | 80 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Bushra Parveen](https://appshunter.io/developer/1539414280) | [莎 杜](https://appshunter.io/developer/1869482218) |

## What reviewers say

### Fast PDF Document Scanner App

[App page](https://appshunter.io/ios/app/fast-pdf-document-scanner-app/id1546735522)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Month SC | $2.99 | per month |
| Three Month SC | $9.49 | per 3 months |
| One Year SC | $17.99 | per year |
| Life time - One time | $24.99 | one-time |


### Khenix

[App page](https://appshunter.io/ios/app/khenix/id6758949856)

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| free_ads_package | Free | one-time |
| More Ads Package | $1.99 | one-time |
| Featured ads for 10 days | $5.99 | one-time |
| 30 Days ads package | $9.99 | one-time |
| VIP Ads Package | $14.99 | one-time |
| Featured ads for 15 days | $17.99 | one-time |


## Frequently asked questions

### Is Fast PDF Document Scanner App free?

Fast PDF Document Scanner App is free to download, with in-app purchases available.

### Is Khenix free?

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

### Do Fast PDF Document Scanner App or Khenix have ads?

Neither Fast PDF Document Scanner App nor Khenix shows ads.

### Which is updated more often, Fast PDF Document Scanner App or Khenix?

Fast PDF Document Scanner App ships an update every 3 months, and Khenix every 3 weeks. Most recently, Fast PDF Document Scanner App was updated on October 8, 2026 and Khenix on October 2, 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.*