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A code coverage tool for .NET 2 and above, support for 32 and 64 processes with both branch and sequence points; roots proudly based in PartCover
C# C++ XSLT Batchfile C PowerShell Cucumber
Pull request Compare This branch is 4 commits ahead of OpenCover:master.

The latest releases can be downloaded from releases or from the OpenCover mirror site on bitbucket. Alternatively why not try the nuget package (this is the most popular).

Build status Coverage Nuget Nuget Nuget


The primary repo for the project is on GitHub and is also where the wiki and issues are managed from.

Team communication

Join the chat at


Please review the wiki pages on how to use OpenCover and take particular interest in the Usage guide.


Please raise issues on GitHub, if you can repeat the issue then please provide a sample to make it easier for us to also repeat it and then implement a fix. Please do not hijack unrelated issues, I would rather you create a new issue than add noise to an unrelated issue.

Dropbox is very useful for sharing files alternatively you could create a gist.


All Original Software is licensed under the MIT Licence and does not apply to any other 3rd party tools, utilities or code which may be used to develop this application.

If anyone is aware of any licence violations that this code may be making please inform the developers so that the issue can be investigated and rectified.

Integration Test support

OpenCover was initially created to support unit testing techniques such as TDD and tools like NUnit and MSTest. Over time others have found ways to use OpenCover for integration testing especially in tricky scenarios such as IIS and Windows Services. I'll put links here as to how people have achieved this however as they say YMMV (You Mileage May Vary).

IIS support

Please refer to the wiki - IIS Support

DNX support

Please refer to the wiki - DNX Support

Win8/Win10 Application Support

Note yet implemented. Sorry no call for it I assume the WPF way of separating model and UI has led to people getting all they need from unit-tests; I know how that is how it works for me.

Service support

please refer to the wiki - Service Support

Silverlight support

Please refer to wiki - Silverlight support


You will need:

  1. Visual Studio VS2013 (Community Edition) or later with C# and C++
  2. WiX 3.9 or later (
  3. Specflow (

All other software should be included with this repository.

NANT scripts (encapsulated by the build.bat file) are used to build the project outside visual studio and will run all unit tests.

To build the code in 32-bit Debug mode just run Build in the root of the project folder.

To build a release package including installer, zip and nuget packages use

build create-release

Build Server

The OpenCover team is using Appveyor for automated building. It runs a staged equivalent of

build create-release

and stores all the information about tests, coverage and other build artefacts; you can use these builds if you want to be 'cutting' edge but support will be limited.

We have also suppied the appveyor.yml to make it easy for any forks to have their own builds on AppVeyor. If you send a pull-request the CI system will test your commits (which saves the team time if we do it ourselves)


The current OpenCover coverage (found by dogfooding OpenCover on its own tests) can be viewed here

Code Coverage via Coveralls


For local viewing of the output from OpenCover start here.

Latest Drop as ZIP

No Git? Don't worry you can download the latest code as a zip file.


I would like to thank

  • JetBrains for my Open Source ReSharper licence,

  • AppVeyor for allowing free build CI services for Open Source projects,

  • Coveralls for allowing free services for Open Source projects,
  • NDepend for my NDepend licence,
  • the guys at CodeBetter, Devlicious and Los Techies who orignally arranged my MSDN licence all those years ago without which I doubt I'd have been able to start OpenCover (now no longer needed as we can build OpenCover using the VS2013 Community Edition),
  • the NextGenUG and their free swag from where I got lots of useful tools,

I'd also like to thank my family, employers, colleagues and friends for all their support.

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