SPIN

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Score7.1

Rank#5 of 33

PriceFree

Free planYes

Runs onLinux, macOS, Windows

Summary

SPIN is a free tool for checking whether asynchronous systems meet logical correctness requirements. It is used for distributed software and communication protocols, whose behavior is specified in Promela. The language can represent asynchronous processes, nondeterministic choices, loops, and local or global variables; models can express requirements including linear temporal logic properties. SPIN supports interactive, guided, and random simulation of system execution. For verification, it can generate C code to check requirements exhaustively or approximately. The product description says it checks for deadlocks, race conditions, incomplete specifications, and assumptions about process speeds that are not justified. Partial order reduction is listed as an optimization, and the site provides guidance on multicore algorithms and swarm methods for large state spaces. SPIN is self-hosted and runs on Linux, macOS, and Windows, among other listed systems. From version 6.4.5, its code, sources, and executables are available under the BSD 3-Clause license. Verification requires a working C compiler and preprocessor; the optional iSpin graphical interface requires Tcl/Tk.

Who it is for

SPIN suits people modeling distributed software or communication protocols who need to simulate or verify asynchronous behavior. It is self-hosted and requires Promela specifications, plus a C compiler and preprocessor for verification.

What is good

Free under the BSD 3-Clause license from version 6.4.5.
Supports simulation and verification of models.
Checks for deadlocks and race conditions.
Supports linear temporal logic properties.
Available for Linux, macOS, and Windows.

What to know first

Verification requires a working C compiler and preprocessor.
Optional iSpin interface requires Tcl/Tk.
Models must be specified in Promela.

Verdict

SPIN offers simulation and model checking for asynchronous systems, with tools for finding several kinds of specification and behavior problems. Account for its Promela input and compiler requirements when considering it.

SPIN plans and pricing

All plans

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

Compared on formal verification tools

Free plan: Yesspinroot.com
Verification method: model-checkingspinroot.com
Supported formalisms: temporal-logicspinroot.com
Counterexamples: Yesspinroot.com
Input languages: Promelaspinroot.com
Deployment: self-hostedspinroot.com

Facts

Purpose: SPIN analyzes the logical consistency of asynchronous systems, including distributed software and communication protocols.spinroot.com · 3 Oct 2026
Model language: Systems are specified in Promela, which supports asynchronous processes, nondeterministic choices, loops, and local and global variables.spinroot.com · 3 Oct 2026
Correctness properties: Promela models can specify logical correctness requirements, including requirements expressed in linear temporal logic.spinroot.com · 3 Oct 2026
Simulation: SPIN supports interactive, guided, and random simulations of a system’s execution.spinroot.com · 3 Oct 2026
Verification: SPIN can generate a C program for exhaustive or approximate verification of a model’s correctness requirements.spinroot.com · 3 Oct 2026
Issue detection: The product description says SPIN checks specifications for deadlocks, race conditions, incompleteness, and unwarranted assumptions about process speeds.spinroot.com · 3 Oct 2026
Partial order reduction: SPIN’s product description lists partial order reduction as an optimization for verification runs.spinroot.com · 3 Oct 2026
Multicore and swarm: The binaries page links guidance for multicore DFS and BFS algorithms and for swarm methods to handle large state spaces.spinroot.com · 3 Oct 2026
License: Starting with SPIN version 6.4.5, its code, sources, and executables are available under the BSD 3-Clause license.spinroot.com · 3 Oct 2026
Operating systems: The download instructions say SPIN runs on Unix, Solaris, Linux, most Windows PCs, and Macs.spinroot.com · 3 Oct 2026
Build requirement: The installation guide says SPIN requires a working C compiler and C preprocessor for verification.spinroot.com · 3 Oct 2026
Optional interface: iSpin is an optional graphical interface written in Tcl/Tk, and the guide says it requires Tcl/Tk.spinroot.com · 3 Oct 2026
Support and learning: The site provides manual pages, tutorials, papers, books, and a forum through its homepage navigation.spinroot.com · 3 Oct 2026