# AudioBookSync vs Offline PDF Viewer

The clearest difference is update cadence: Offline PDF Viewer at daily against AudioBookSync's every 2 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. AudioBookSync sells 1 one-off in-app purchase and Offline PDF Viewer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

AudioBookSync ships an update every 2 weeks, Offline PDF Viewer daily. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | AudioBookSync | Offline PDF Viewer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Daily** |
| Size | 12 MB | 10 MB |
| Requires iOS | 18.6 | **17.6** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hans-Peter Jordi](https://appshunter.io/developer/1879027494) | [takaaki024](https://appshunter.io/developer/393783638) |

## What reviewers say

### AudioBookSync

[App page](https://appshunter.io/ios/app/audiobooksync/id6759492424)

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AudioBookSync Pro | $5.99 | one-time |


### Offline PDF Viewer

[App page](https://appshunter.io/ios/app/offline-pdf-viewer/id6789788357)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support Developer | $2.99 | one-time |


## Frequently asked questions

### Is AudioBookSync free?

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

### Is Offline PDF Viewer free?

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

### Do AudioBookSync or Offline PDF Viewer have ads?

Neither AudioBookSync nor Offline PDF Viewer shows ads.

### Which is updated more often, AudioBookSync or Offline PDF Viewer?

AudioBookSync ships an update every 2 weeks, and Offline PDF Viewer daily. Most recently, AudioBookSync was updated on October 7, 2026 and Offline PDF Viewer 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.*