# AudioBookSync vs Spine

The clearest difference is in-app purchases: Spine at none against AudioBookSync's 1. Spine also leads on update cadence (every 4 days vs every 2 weeks). AudioBookSync's advantage is iOS requirement (18.6 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. AudioBookSync sells 1 one-off in-app purchase. Spine asks for nothing beyond the download.

AudioBookSync ships an update every 2 weeks, Spine every 4 days. The most recent releases landed on October 7, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | AudioBookSync | Spine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (25 ratings)](https://appshunter.io/ios/app/spine-audiobook-player/id6764636615/reviews)** |
| Number of ratings | — | **25** |
| Positive reviews | — | 81.8% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 4 days** |
| Monetization | — | Free |
| Size | 12 MB | 15 MB |
| Requires iOS | **18.6** | 26.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, Apple Watch |
| Age rating | 4+ | 12+ |
| Developer | [Hans-Peter Jordi](https://appshunter.io/developer/1879027494) | [Accelyze Inc.](https://appshunter.io/developer/1895859588) |

## 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 |


### Spine

[App page](https://appshunter.io/ios/app/spine-audiobook-player/id6764636615)

This app enhances audiobook listening with features like listener levels, daily streaks, and shareable year-end recaps. It offers a beautiful, integrated player and syncs with Hardcover, all while keeping your data private on-device.

**Highlights:** Integrated audiobook player, Listener levels and daily streaks, Hardcover sync, On-device AI summaries, Shareable year-in-review recap, Lock screen and widget controls

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

**In-app purchases:** none


## Frequently asked questions

### Is AudioBookSync free?

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

### Is Spine free?

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

### Do AudioBookSync or Spine have ads?

Neither AudioBookSync nor Spine shows ads.

### Which is updated more often, AudioBookSync or Spine?

AudioBookSync ships an update every 2 weeks, and Spine every 4 days. Most recently, AudioBookSync was updated on October 7, 2026 and Spine on October 20, 2026.

---

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