AudioBo turns audio files into real M4B audiobooks — with proper chapters, clean metadata, and reliable long-form playback.
MP3 files work well for music, but fall apart for audiobooks: no true chapter support, unreliable bookmarks, and inconsistent resume behavior. AudioBo builds real M4B audiobooks instead — the format designed specifically for long-form listening.
M4B supports chapters, bookmarks, and clean navigation in Apple Books, Music, CarPlay, and even classic iPods. AudioBo produces correctly structured M4B files — not repackaged audio that only looks like an audiobook.
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WHO AUDIOBO IS FOR
For anyone who wants a proper M4B audiobook — without a PhD in terminal tools, codecs, or settings.
AudioBo handles the technical choices for you, aiming for the best possible quality without unnecessary file size bloat.
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WHAT MAKES AUDIOBO DIFFERENT
- No arbitrary limits
Create audiobooks of any length — from short recordings to multi-hour projects — without forced splitting or awkward workarounds.
- No unnecessary re-encoding
If you only change metadata or artwork, AudioBo preserves the original audio stream — no quality loss, no wasted processing.
- Pull metadata from the web
Search Audible, Apple Books, MusicBrainz, Google Books, and TMDB (movies & TV) to fill in cover art, book info, and chapter names - all in one click.
- AI chapter cleanup, on-device
Tap "Enhance with AI" and Apple Intelligence instantly rewrites and fixes messy chapter titles.
- Correct M4B container & chapter standards
AudioBo writes proper M4B files with full support for QuickTime and Nero chapter formats — a clean, standards-compliant container that behaves correctly everywhere, not fragile hacks that only look right.
- Batch chapter cleanup
Clean up messy chapters in one go: normalize titles, fix ordering, remove junk entries, and make the chapter list consistent — without babysitting every book manually.
- Export beyond M4B (M4A & MP3 too)
Need compatibility over “perfect audiobook”? Export to M4A or MP3 for locked-down DAP players, vintage car stereos, and other non-Apple setups.
- Turn videos into audiobooks
Have a lecture, talk, or documentary as a video? Drop in a video file — MKV, MP4, MOV, AVI, and more — and AudioBo extracts the audio into a proper audiobook. When a video has several audio tracks, you pick the language you want.
- External chapters: CUE + simple chapter.txt
Bring your own chapters via external files (CUE and more), or define them yourself using a plain chapter.txt with a simple YouTube-style timestamp format — fast, readable, and easy to edit.
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TECHNICAL DETAILS (FOR THE CURIOUS)
AudioBo works with the formats people actually have. You can bring in MP3, AAC (M4A), OGG, WAV, WMA, WV, APE, FLAC, Opus, or AIFF. You can also drop in a video file — MKV, MP4, MOV, AVI, and more — and AudioBo pulls out its audio track for you.
Audio encoding options:
- M4B/M4A in AAC-LC/HE-AAC/xHE-AAC, MP3
- Mono or stereo, based on your source
- Bitrates from 16 to 320 kbps
- Sample rates from 22.05 up to 96 kHz
Compatibility:
- Plays natively on Apple Books, Music, iOS, macOS, and classic iPods
- Works smoothly with Plex, BookPlayer, VLC, Audiobookshelf, and most audiobook apps
- Fully supported on Android and Windows through any modern audio player
- Export directly to Apple Books with proper chapters, artwork, and metadata
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Learn more and download a demo at: orsolabs.dev/audiobo
This app hasn’t received enough ratings or reviews to display an overview.
Finally, the audiobook converter I’ve been waiting for
LaznenkoA
I’ve been building a personal audiobook collection for years, and the lack of a decent MP3-to-M4B converter for Mac was always my biggest headache. Most tools I tried were either command-line nightmares or ancient apps with interfaces straight out of 2005. AudioBo is neither.What makes it stand out is how it handles all the technical stuff — codecs, bitrates, channel settings — automatically. You just pick a quality preset and hit convert. The app is smart enough to not let you make bad choices, which is something no other converter bothered to get right.Chapter management is genuinely excellent. You can easily merge, rename, and reorder tracks right inside the app before exporting. The metadata editor is just as solid — series, book number, author, cover art — everything that makes your library look clean and sort correctly in Apple Books.Best feature nobody talks about: if you only need to update the cover art or title, it saves the changes without re-encoding the entire audio file. That alone saves a ton of time and preserves quality.One-time purchase at $9.99. No subscription, no nonsense. Absolutely worth it.
Works Great
dtew22
I have tested this with multiple audiobook builds so far. All of them have worked great. The one thing that I really like is that this will let me build single file audiobooks longer than 24 hours. It always annoyed me with other apps that they would not work with a file longer than 24 hours. They always made me split the audiobook into multiple parts. So, thanks to the developer for this great app! It would be really nice if it would let me choose a different default save location. Another nice addition would be if it remembered my custom output settings so I don’t have to select them again for each build. Those two updates would make this app perfect for me.Update:Great updates! The program is working great. I have noticed that if I have an audiobook that is already .m4b format and I want to re encode it from stereo into mono and change the bit rate, it struggles with those. I’m not sure why, but it doesn’t seem to like converting from one .m4b into another one. No big deal. It works great with everything else i’ve thrown at it. Thanks for the extremely handy app! Update:The updates keep coming, and the app keeps getting better and better! This app will do everything I need it to do. Far and away, the best audiobook conversion app I’ve found.
Developer Response
UPD: Could you drop me a line at vlad@orsolabs.dev? Then we can figure out what’s going on. Thanks!UPD (v1.1.3): You can now set a default export folder in the new Settings window (⌘,). Custom output settings are also saved automatically — no need to reselect them each time. Thanks again for the great ideas!Thanks for the great feedback! The automatic remembering of custom output settings is already available starting from version 1.1.1 — feel free to try it out. Thanks for the good idea!As for automatically saving books to a specific folder, that’s something I’m adding in the next update.
A great app, keeps getting better
DrOct
This is by far the best way to take audiobooks that are split into numerous parts, like those from CDs, and turn them into one file with embedded metadata, chapters etc. It works great, it’s thoughtfully designed, and it keeps gettin better! The app is updated fairly often and every time it adds new helpful features. At one point recently I contacted the developer because I had a feature I wished worked differently. Not only did he respond quickly, he revealed that he was already working on the feature, and it would be in the next version which would be released within days! True to his word it was released later that week, and works brilliantly. This is a well designed app by someone who clearly cares about making it the best it can be and about the details. I can’t recommend it enough.
An Outstanding App to Build Audiobooks!
Scott_GSD
I have used a couple of apps in the past, which worked, but they were slow and lacked the functionality of AudioBo. One of the features most appreciated is the ability to retrieve and modify meta data for books. I also truly appreciate the speed for the process of building the books. I used AudioBo to build alarge book for a guitar course and it did an outstanding job. I also appreciate that the developer has made the app accessible for users with various disabilities. I highly recommend AudioBo.
– Genre field is compatible with Audiobookshelf and more
– Progress bar now covers every stage of a build
– Cancel responds faster at any point during a build
– Smoother cover loading from external and network drives
If you're enjoying AudioBo, a quick review on the App Store helps a lot — thank you!
Version 1.3.9
The developer, Iryna Horokhovska, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
The developer indicated that this app supports the following accessibility features. Learn More