Oahu David Obando

audible audiobook decrypter downloader m4b

Use this command to install Oahu:

winget install --id=DavidObando.Oahu -e

Oahu is an Audible downloader app for Windows, macOS, and Linux. Features include direct download from the Audible server, sign-in via standard web browser, library browsing with title selection, download and conversion to plain .m4b files, detailed progress monitoring, and optional export as .aax files.

Oahu

A standalone Audible downloader and decrypter

Oahu is an Audible downloader app for Windows, macOS, and Linux. Forked from audiamus/BookLibConnect.

Features

Free and Open Source software.
Direct download from the Audible server.
Sign-in via standard web browser to register a device, app will not see user’s credentials.
Lists your book library and lets you select titles for download.
Downloads your books and converts to plain .m4b files.
Detailed progress monitoring.
Optionally exports as .aax files.

Download

Go to the Releases section of this repository to download installers for Windows (arm64, x64), DMG images for macOS (arm64, x64), or tarballs with the compiled binaries for Linux and macOS (arm64, x64).

Install via Homebrew (macOS / Linux)

brew tap DavidObando/oahu https://github.com/DavidObando/Oahu
brew install oahu

Install via WinGet (Windows)

winget install DavidObando.Oahu

Dependencies

Oahu will run on Windows 64bit, macOS, or Linux. Minimum Windows version is 7. Minimum macOS version is 13 (Ventura).

Building from source

The repository now ships a single cross-platform Avalonia client (Windows, macOS, Linux).

# Build the full solution
dotnet build src/Oahu.sln

# Run the Avalonia app
dotnet run --project src/Connect.app.avalonia.core/Connect.app.avalonia.core.csproj

# Publish for macOS (Apple Silicon)
dotnet publish src/Connect.app.avalonia.core/Connect.app.avalonia.core.csproj \
  -r osx-arm64 -c Release --self-contained -p:PublishTrimmed=true

# Publish for macOS (Intel)
dotnet publish src/Connect.app.avalonia.core/Connect.app.avalonia.core.csproj \
  -r osx-x64 -c Release --self-contained -p:PublishTrimmed=true

# Publish for Windows
dotnet publish src/Connect.app.avalonia.core/Connect.app.avalonia.core.csproj \
  -r win-x64 -c Release --self-contained -p:PublishTrimmed=true

# Publish for Linux
dotnet publish src/Connect.app.avalonia.core/Connect.app.avalonia.core.csproj \
  -r linux-x64 -c Release --self-contained -p:PublishTrimmed=true

Build scripts

Platform-specific build scripts are provided in the build/ directory:

# macOS — creates .app bundle + DMG (with optional code signing and notarization)
./build/build-macos.sh

# Windows — publishes Avalonia app (with optional Inno Setup installer)
./build/build-windows.ps1

# Linux — publishes Avalonia app and creates tarball
./build/build-linux.sh

Project Architecture

Shared (platform-neutral):
  CommonTypes.lib.core    — Interfaces and enums
  AuxLib.core             — Utilities, logging, settings
  Audible.json.core       — Audible API JSON models
  BooksDatabase.core      — EF Core + SQLite database
  TreeDecomposition.core  — Diagnostics
  CommonUtil.lib.core     — File operations, online update
  Connect.lib.core        — Core business logic (Audible API, library, auth)

Cross-platform Avalonia app (Windows, macOS, Linux):
  AuxWin32Lib.core         — Win32 file I/O helper (used conditionally)
  SystemMgmt.core         — Windows hardware ID (WMI)
  SystemMgmt.mac.core     — macOS hardware ID (sysctl/IOKit)
  SystemMgmt.linux.core   — Linux hardware ID (DMI/machine-id)
  Connect.ui.avalonia.core — Avalonia MVVM ViewModels + Views
  Connect.app.avalonia.core — Avalonia application entry point

Acknowledgments

audiamus for his original implementation of BookLibConnect. This repository is a fork of audiamus' work.
mkb79 for his Python library which served as the reference implementation of the Audible API to me, straightforward and easy to follow.
Mbucari for his Audible decryption library in C#. While recent FFmpeg releases can also do it, it is much more convenient to have an in-process solution.
rmcrackan for the other C# implementation of an Audible client library, absolutely worth the occcasional side glance.

Anti-Piracy Notice

Note that this software does not ‘crack’ the DRM or circumvent it in any other way. The application applies account and book specific keys, retrieved directly from the Audible server via the user’s personal account, to decrypt the audiobook in the same manner as the official audiobook playing software does. Please only use this application for gaining full access to your own audiobooks for archiving/conversion/convenience. De-DRMed audiobooks must not be uploaded to open servers, torrents, or other methods of mass distribution. No help will be given to people doing such things. Authors, retailers and publishers all need to make a living, so that they can continue to produce audiobooks for us to listen to and enjoy.

(This blurb is borrowed from https://github.com/KrumpetPirate/AAXtoMP3 and https://apprenticealf.wordpress.com/).