Alloy 4 is a self-contained executable, which includes the Kodkod model finder and a variety of SAT solvers, as well as the standard Alloy library and a collection of tutorial examples. The same jar file can be incorporated into other applications to use Alloy as an API, and includes the source code. See the release notes for details of new features. To execute, simply double-click on the jar file, or type java -jar alloy4.jar in a console.

experimental versions

Latest build Alloy 5.0 (includes the version for macOS High Sierra)

stable releases

alloy4.2.jar Alloy 4.2 (platform independent). Requires Java 6.
alloy4.2.dmg Alloy 4.2 (for OS X). Requires Java 6.
alloy4.jar Alloy 4.1 (platform independent). Requires Java 5.
alloy4.dmg Alloy 4.1 (for OS X). Requires Java 5.

Alloy extensions


  • Public web page:
  • Authors: Nuno Macedo, Julien Brunel, David Chemouil, Alcino Cunha
  • Synopsis: Electrum extends Alloy with mutable signatures and fields as well as connectives from Linear Temporal Logic (with Past), it is well suited to model systems featuring both structural and behavioral aspects. Verification relies on bounded and unbounded model-checking; and the Visualizer is extended to allow interactive exploration of traces.