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OR-Tools - Google Optimization Tools

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Google's software suite for combinatorial optimization.

Table of Contents

About OR-Tools

Google Optimization Tools (a.k.a., OR-Tools) is an open-source, fast and portable software suite for solving combinatorial optimization problems.

The suite contains:

  • A constraint programming solver;
  • A linear programming solver;
  • Wrappers around commercial and other open source solvers, including mixed integer solvers;
  • Bin packing and knapsack algorithms;
  • Algorithms for the Traveling Salesman Problem and Vehicle Routing Problem;
  • Graph algorithms (shortest paths, min cost flow, max flow, linear sum assignment).

We wrote OR-Tools in C++, but also provide wrappers in Python, C# and Java.


This software suite is composed of the following components:


This software suite has been tested under:

  • Ubuntu 16.04 and up (64-bit);
  • Apple macOS Mojave with Xcode 7.x (64-bit);
  • Microsoft Windows with Visual Studio 2017 (64-bit).

OR-Tools currently builds with a Makefile, but also provides Bazel and CMake support.

For installation instructions (both source and binary), please visit

Experimental Build with CMake

We also provide experimental CMake support.
Please check the CMake build instructions.

Quick Start

The best way to learn how to use OR-Tools is to follow the tutorials in our developer guide:

If you want to learn from code examples, take a look at the examples in the examples directory.


The complete documentation for OR-Tools is available at:


The file contains instructions on how to submit the Contributor License Agreement before sending any pull requests (PRs). Of course, if you're new to the project, it's usually best to discuss any proposals and reach consensus before sending your first PR.


The OR-Tools software suite is licensed under the terms of the Apache License 2.0.
See LICENSE-2.0 for more information.

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