Side by side

Alloy Analyzer vs CPAchecker

Both stand on formal verification tools. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

Alloy Analyzer

Free plan APILinuxMac+1

Alloy Analyzer combines constraint-based model exploration with graphical views and counterexample generation. Temporal model checking adds a separate installation requirement, so users should account for NuSMV or nuXmv when planning that workflow.

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CPAchecker

Free plan LinuxMacSelf-hosted+1

CPAchecker provides a focused set of configurable program-verification capabilities, with multiple installation routes and supporting documentation. Check that your input language, Java version, and deployment environment match its requirements.

Visit CPAchecker

The facts

	Alloy Analyzer	CPAchecker
Free plan	Yes	Yes
Open source	Not published	Not published
Runs on	API, Linux, Mac, Windows	Linux, Mac, Self-hosted, Windows
Lowest paid plan	Free or on request	Free or on request
Plans published	1	1
Maker	Not published	Not published
Website	alloytools.org	cpachecker.sosy-lab.org
On formal verification tools	#1 of 34	#3 of 34

Alloy Analyzer: what it does well

Free, self-contained executable includes examples and source.
Finds structures and counterexamples to properties.
Graphical results can be customized.
JAR can be used as an API.

What to know first

Temporal model checking requires NuSMV or nuXmv.
Those temporal tools must be available in PATH.
Modeling uses the Alloy language.

CPAchecker: what it does well

Free software under the Apache 2.0 License
Supports C and SV-LIB inputs
Produces counterexamples and proof artifacts
Offers Debian and Ubuntu installation through APT
Docker image is available

What to know first

Requires Java 21 or later
Older web version lacks some features
Newer Linux configurations may require recent distributions

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