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Weka

Collection of machine learning algorithms

As of 30 August 2026, Weka is free to use. Weka is a collection of machine learning algorithms for data mining tasks implemented in Java. Softwr lists it under Machine Learning. Weka is made by University of Waikato, launched in 1993, available on Linux, macOS, Windows.

Overview

What Weka does

Weka is a collection of machine learning algorithms for data mining tasks implemented in Java. It provides tools for data preprocessing, classification, regression, clustering, association rules mining, and visualization with a user-friendly GUI.

What people use it for

  • Teaching and exploring classic machine learning algorithms through a GUI
  • Running data mining experiments and preprocessing without writing code

The honest half

Where it falls short

Concrete and checkable, so you can decide whether any of them matter to you. This is the half of a review a vendor will not write about Weka.

  • The package management system needs an internet connection to download and install packages, so an air-gapped install gets only the core distribution
  • Weka is split into a stable 3.8 branch that receives only bug fixes and compatibility-safe upgrades and a 3.9 development branch that may receive features that break compatibility
  • Weka requires a 64-bit Java VM; the bundled installers ship Bellsoft OpenJDK 25 per platform and architecture

Cross-shopped

What people choose instead of Weka

Each pairing was judged by two reviewers asking whether a buyer would genuinely weigh the two against each other. The ones that failed were deleted rather than published.

Pricing

What Weka costs

Taken from the vendor's own pricing page. Prices move, so check before you buy.

Open Source

Free

  • All ML algorithms
  • GUI and CLI
  • Java API

Capabilities

Features

  • Classification

  • Regression

  • Clustering

  • Association rules

  • Feature selection

  • Java

    Integration with Java

  • R

    Integration with R

  • Python

    Integration with Python

  • Linux support

    Available on linux

  • Mac support

    Available on mac

  • Windows support

    Available on windows

Answered, with sources

Questions people ask

Each answer names the page it came from, so you can check it rather than take our word for it.

What is the cost of Weka software?

Weka is provided at no cost as open-source software released under the GNU General Public License, making it freely available for download and use.

Source
Are there commercial licensing options available?

Yes, the project offers information about commercial licenses for organizations requiring non-GPL terms, which can be found in their commercial applications documentation.

Source
What support resources are available to users?

Multiple support avenues exist including comprehensive documentation, frequently asked questions, dedicated help resources, and access to courses for learning the platform.

Source
Is source code access provided?

Yes, developers have full access to source code through the Git repository, along with development documentation and code credits for contributors.

Source

Behind it

Who makes Weka

Company
University of Waikato
Based in
Hamilton, New Zealand
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Softwr does not host reviews and shows no star rating for Weka, because a rating we did not collect is not ours to publish. What is here is the pricing and platform detail from the vendor’s own pages, limitations we could state concretely, and alternatives a reviewer confirmed people weigh against it. Tell us if any of it is wrong.

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