# Open Polytechnic Library vs Audiobooks

The clearest difference is in-app purchases: Open Polytechnic Library at none against Audiobooks's 3. Audiobooks's advantage is update cadence (every 3 weeks vs every 43 months) and device support (4 vs 2). On price and ads there is nothing between them.

Both are free to download. Audiobooks sells 3 in-app purchases, starting at $2.99 per 7 days. Open Polytechnic Library asks for nothing beyond the download.

Open Polytechnic Library ships an update every 43 months, Audiobooks every 3 weeks. The most recent releases landed on October 16, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Open Polytechnic Library | Audiobooks |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 43 months | **Every 3 weeks** |
| Size | 43 MB | 37 MB |
| Requires iOS | 26.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Stacks Inc.](https://appshunter.io/developer/1275752393) | [DEVSRANK](https://appshunter.io/developer/1716669578) |

## What reviewers say

### Open Polytechnic Library

[App page](https://appshunter.io/ios/app/open-polytechnic-library/id6443709955)

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

**In-app purchases:** none


### Audiobooks

[App page](https://appshunter.io/ios/app/audiobooks-audioly/id6760335364)

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Audioly Weekly | $2.99 | per 7 days |
| Audioly Yearly Disc | $7.99 | per year |
| Audioly Yearly | $14.99 | per year |


## Frequently asked questions

### Is Open Polytechnic Library free?

Open Polytechnic Library is free to download, with no in-app purchases.

### Is Audiobooks free?

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

### Do Open Polytechnic Library or Audiobooks have ads?

Neither Open Polytechnic Library nor Audiobooks shows ads.

### Which is updated more often, Open Polytechnic Library or Audiobooks?

Open Polytechnic Library ships an update every 43 months, and Audiobooks every 3 weeks. Most recently, Open Polytechnic Library was updated on October 16, 2026 and Audiobooks on October 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*