Alloy Analyzer

7.1easy start · #4 of 33
in Formal Verification Tools

Free to practise onyes
Free trialnot on record
Well documentedyes
Runs where you workyes

Runs on api, Linux, Mac, Windows.

Alloy Analyzer is ranked #4 of 33 in formal verification tools on The Geeks Club. It runs on API, Linux, macOS, Windows. There is a free plan.

Alloy Analyzer plans and pricing

All plans

Alloy Analyzer Free Open source project · self-contained executable alloytools.org · 4 Oct 2026

Compared on formal verification tools

Free plan: Yes
Verification method: model-checking
Supported formalisms: invariants
Counterexamples: Yes
Input languages: Alloy language
Deployment: self-hosted

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The record

Purpose: Alloy is a language for describing evolving structures, and the Alloy Analyzer explores models by finding structures that satisfy constraints or counterexamples to properties.
Modeling: Alloy models describe sets of structures that may evolve over time, such as security configurations or switching network topologies.
Visualization: The Analyzer displays structures graphically, and their appearance can be customized for the domain.
Temporal analysis: Alloy 6 adds mutable state, temporal logic, and temporal model checking; the latter relies on NuSMV or nuXmv installed by the user and available in PATH.
Bundled components: The self-contained executable includes the Pardinus/Kodkod model finder, SAT solvers, the standard Alloy library, tutorial examples, and source code.
API: The same JAR file can be incorporated into other applications to use Alloy as an API.
Platforms: The download page identifies Alloy 6.2.0 and says it includes a version for macOS High Sierra; it also describes running the JAR with Java.
Visualizer extension: Sterling is a web-based Alloy visualizer customizable and extendable with JavaScript, with graph and table views.
Applications: The project links applications including Alloy*, a Ruby embedding, a bounded Java verifier, and a firewall security policy analyzer.
Community support: The project is maintained by volunteers, with Discourse as its main discussion venue and Stack Overflow as the venue for precise questions monitored by developers.
Security use: The project says Alloy has been used to find holes in security mechanisms and describes modeling security configurations of web applications as an example.
Origin: Alloy was created in MIT's Software Design Group.
Release: The site lists Alloy 6.2.0 as the latest release, dated 2025-01-09.
Price from: Free

Where it ranks on The Geeks Club

Best Formal Verification Tools in 2026#4 of 33

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Sources

alloytools.org/about.html· checked 4 Oct 2026
alloytools.org/download.html· checked 4 Oct 2026
alloytools.org/applications.html· checked 4 Oct 2026
alloytools.org/community.html· checked 4 Oct 2026
alloytools.org· checked 4 Oct 2026