Coq is a formal proof management system. It provides a formal language to write mathematical definitions, executable algorithms and theorems together with an environment for semi-interactive development of machine-checked proofs.

Download the pre-built packages of the latest release for Windows and MacOS; read the help page on how to install Coq with OPAM; or refer to the INSTALL file for the procedure to install from source.

The sources of the documentation can be found in directory doc. See doc/README.md to learn more about the documentation, in particular how to build it. The documentation of the last released version is available on the Coq web site at coq.inria.fr/documentation. See also Cocorico (the Coq wiki), and the Coq FAQ, for additional user-contributed documentation.

There is a file named CHANGES.md that explains the differences and the incompatibilities since last versions. If you upgrade Coq, please read it carefully.

The Coq Club moderated mailing list is meant to be a standard way to discuss questions about the Coq system and related topics. The subscription link can be found at coq.inria.fr/community.

The topics to be discussed in the club should include:

• technical problems;
• questions about proof developments;
• suggestions and questions about the implementation;
• announcements of proofs;
• theoretical questions about typed lambda-calculi which are closely related to Coq.

Please report any bug / feature request in our issue tracker.

To be effective, bug reports should mention the OCaml version used to compile and run Coq, the Coq version (coqtop -v), the configuration used, and include a complete source example leading to the bug.

Guidelines for contributing to Coq in various ways are listed in the contributor's guide.

Help the Coq community grow and prosper by becoming a sponsor! The Coq Consortium can establish sponsorship contracts or receive donations. If you want to take an active role in shaping Coq's future, you can also become a Consortium member. If you are interested, please get in touch!