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SPECIFICTION
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JACK Audio Connection Kit

jackaudio.org

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Spec score 7.8 #12 of 30 in Audio Enhancement Software

What it is

JACK Audio Connection Kit is a free sound server API and daemon implementation for connecting audio and MIDI applications with real-time, low-latency operation. Client applications can connect to an audio device and share audio with one another. JACK emphasizes synchronous execution among clients. Applications communicate through callbacks and registered ports to send and receive data, and audio is represented internally as 32-bit floating-point values. Compatible applications listed by the project include Audacity, Ardour, Blender, Mixxx, QjackCtl, and VLC. JACK is available for Linux, macOS, and Windows. Linux users are directed to their distribution’s package manager for binaries; listed macOS installers are for macOS 10.12 or higher, and Windows installers are for Windows 7 or higher. The project hosts JACK1 and JACK2 source repositories on GitHub. The server uses the GPL, while the library uses the LGPL, which permits proprietary programs to link with it. The project directs users to mailing lists, IRC channels, and community forums for help. The software is distributed without warranty, including implied warranties of merchantability or fitness for a particular purpose.

Spec sheet

Purpose
JACK is a professional sound server API and daemon implementations for real-time, low-latency connections between audio and MIDI applications.Read 7 Oct 2026 · jackaudio.org
Platforms
The downloads page provides Linux packages or source, macOS installers or source, and Windows installers or source.Read 7 Oct 2026 · jackaudio.org
Integrations
The applications directory lists compatible tools including Audacity, Ardour, Blender, Mixxx, QjackCtl, and VLC.Read 7 Oct 2026 · jackaudio.org
Support
The maker points users to JACK and Linux audio mailing lists, IRC channels, and community forums for discussion and help.Read 7 Oct 2026 · jackaudio.org
Audio format
JACK represents audio data internally as 32-bit floating-point values.Read 7 Oct 2026 · jackaudio.org
Audio routing
JACK lets client applications connect to an audio device and share audio with each other.Read 7 Oct 2026 · jackaudio.org
Design focus
JACK’s design focuses on synchronous execution of clients and low-latency operation.Read 7 Oct 2026 · jackaudio.org
Developer API
Applications use a callback model and register ports to send and receive data through JACK.Read 7 Oct 2026 · jackaudio.org
Licensing
JACK is free software; the server uses the GPL and the library uses the LGPL, which permits proprietary programs to link with it.Read 7 Oct 2026 · jackaudio.org
Linux installation
For Linux binaries, the downloads page directs users to their distribution’s package manager.Read 7 Oct 2026 · jackaudio.org
MIDI support
The official site describes JACK connections for both audio and MIDI data.Read 7 Oct 2026 · jackaudio.org
Platform requirements
The listed macOS installers are for macOS 10.12 or higher, and the listed Windows installers are for Windows 7 or higher.Read 7 Oct 2026 · jackaudio.org
Source code
The maker hosts JACK1 and JACK2 source repositories on GitHub and provides clone instructions.Read 7 Oct 2026 · jackaudio.org
Warranty
The software is distributed without warranty, including implied warranties of merchantability or fitness for a particular purpose.Read 7 Oct 2026 · jackaudio.org

Plans and prices

JACK Audio Connection Kit Free Free software; GPL server and LGPL library Read 7 Oct 2026 · jackaudio.org

Every JACK Audio Connection Kit plan and price →

Strong points and limits

Strong points

  • Free software for Linux, macOS, and Windows.
  • Connects applications for audio and MIDI.
  • Library uses LGPL, permitting proprietary linking.
  • Source repositories for JACK1 and JACK2 are hosted on GitHub.

Limits

  • macOS installers require macOS 10.12 or higher.
  • Windows installers require Windows 7 or higher.
  • Software is distributed without warranty.

Who it suits

JACK suits people connecting audio or MIDI applications through a low-latency sound server. Its API and licensing may also matter to developers integrating audio connections into applications.

Verdict

JACK provides low-latency audio and MIDI connections for compatible applications, with a developer API and free software licensing. Platform requirements and the no-warranty terms are worth checking before installation or integration.

Where Specifiction places it

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