AppVeyor is a hosted, distributed continuous integration service used to build and test projects hosted on GitHub and other source code hosting services (including GitLab and Bitbucket) on a Microsoft Windows virtual machine, as well as Ubuntu Linux virtual machines.

AppVeyor is a privately-held Canadian corporation founded in 2011.

[1] AppVeyor is configured using a Web UI, or by adding a file named appveyor.yml, which is a YAML format text file, to the root directory of the code repository.

Azure DevOps includes AppVeyor integration.

[2][3] On 12 November 2014 Microsoft released many parts of their .NET Framework as open-source .NET Core on GitHub, and AppVeyor integration was added to some of these repositories.