SPIN

SPIN is ranked #7 of 33 in formal verification tools on Freedom251. It runs on Linux, macOS, Windows. There is a free plan.

SPIN plans and pricing

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SPIN Free Free source and executables · BSD 3-Clause license spinroot.com · 3 Oct 2026

Compared on formal verification tools

Free plan: Yes
Verification method: model-checking
Supported formalisms: temporal-logic
Counterexamples: Yes
Input languages: Promela
Deployment: self-hosted

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SPIN

Purpose: SPIN analyzes the logical consistency of asynchronous systems, including distributed software and communication protocols.
Model language: Systems are specified in Promela, which supports asynchronous processes, nondeterministic choices, loops, and local and global variables.
Correctness properties: Promela models can specify logical correctness requirements, including requirements expressed in linear temporal logic.
Simulation: SPIN supports interactive, guided, and random simulations of a system’s execution.
Verification: SPIN can generate a C program for exhaustive or approximate verification of a model’s correctness requirements.
Issue detection: The product description says SPIN checks specifications for deadlocks, race conditions, incompleteness, and unwarranted assumptions about process speeds.
Partial order reduction: SPIN’s product description lists partial order reduction as an optimization for verification runs.
Multicore and swarm: The binaries page links guidance for multicore DFS and BFS algorithms and for swarm methods to handle large state spaces.
License: Starting with SPIN version 6.4.5, its code, sources, and executables are available under the BSD 3-Clause license.
Operating systems: The download instructions say SPIN runs on Unix, Solaris, Linux, most Windows PCs, and Macs.
Build requirement: The installation guide says SPIN requires a working C compiler and C preprocessor for verification.
Optional interface: iSpin is an optional graphical interface written in Tcl/Tk, and the guide says it requires Tcl/Tk.
Support and learning: The site provides manual pages, tutorials, papers, books, and a forum through its homepage navigation.
Founded: 1980
Price from: Free

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Where it ranks on Freedom251

Best Formal Verification Tools in 2026#7 of 33

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Sources

spinroot.com/spin/Man/Spin.html· checked 3 Oct 2026
spinroot.com/spin/what.html· checked 3 Oct 2026
spinroot.com/spin/Bin/index.html· checked 3 Oct 2026
spinroot.com/spin/Man/README.html· checked 3 Oct 2026
spinroot.com· checked 3 Oct 2026