# Undulib vs BookJack Player

The clearest difference is review sentiment: Undulib at 83% against BookJack Player's 0%. Undulib also leads on rating (4.5 vs 2.0) and update cadence (monthly vs every 6 months). BookJack Player's advantage is monetization model (free vs paid). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Undulib holds the better App Store score, 4.5 against 2.0. That said, the two scores are not equally well evidenced: Undulib has 29 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 83% of Undulib's written reviews are positive against 0% of BookJack Player's.

Undulib ships an update monthly, BookJack Player every 6 months. The most recent releases landed on October 21, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Undulib | BookJack Player |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (29 ratings)](https://appshunter.io/ios/app/undulib/id1024718755/reviews)** | [2.0 (2 ratings)](https://appshunter.io/ios/app/bookjack-player/id6751657117/reviews) |
| Number of ratings | **29** | 2 |
| Positive reviews | **83.3% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 6 months |
| Monetization | Paid | **Free** |
| Size | 26 MB | 92 MB |
| Requires iOS | **9.0** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Charles Butler](https://appshunter.io/developer/1024718754) | [Brett Ridenour](https://appshunter.io/developer/1829536036) |

## What reviewers say

### Undulib

[App page](https://appshunter.io/ios/app/undulib/id1024718755)

This app is a dedicated audio player designed for audiobook and audio drama enthusiasts. It allows users to easily separate their collections and offers advanced playback features like chapter support, dual progress indicators, and a sleep timer.

**Highlights:** Separates audiobooks from audio dramas, Supports embedded chapters, Supports multi-track books, Dual progress indicators (total and chapter), Remembers playback position, Sleep timer, Supports DRM for Audible and iTunes books

**Features:** macOS Compatibility

**In-app purchases:** none


### BookJack Player

[App page](https://appshunter.io/ios/app/bookjack-player/id6751657117)

This app provides a clean and powerful way to listen to your personal audiobook collection. Import your M4B, M4A, MP3, or FLAC files and enjoy features like adjustable playback speed, smart controls, and a sleep timer.

**Highlights:** Import personal audiobook files (M4B, M4A, MP3, FLAC), Custom folders and search functionality, Adjustable playback speed (0.5x - 3.0x), Smart rewind and skip controls, Sleep timer, Chapter navigation and bookmarks, Dark and Light Mode

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

**In-app purchases:** none


## Frequently asked questions

### Is Undulib free?

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

### Is BookJack Player free?

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

### Which has better reviews, Undulib or BookJack Player?

Undulib is rated higher. Undulib averages 4.5 out of 5 from 29 ratings, while BookJack Player averages 2.0 from 2 ratings.

### Do Undulib or BookJack Player have ads?

Neither Undulib nor BookJack Player shows ads.

### Which is updated more often, Undulib or BookJack Player?

Undulib ships an update monthly, and BookJack Player every 6 months. Most recently, Undulib was updated on October 21, 2026 and BookJack Player on September 19, 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.*