The HSR Parallel Checker is a Visual Studio® extension that detects data races, deadlocks and other concurrency issues in C#.


  • Static: Finds issues that are hard to identify through tests.
  • Fast: Takes only a few seconds, even for large projects.
  • Precise: Detects real issues that can occur indeed at runtime.
  • Interactive: Highlights issues while coding in Visual Studio IDE.

March 2018: Version 0.8 Released!

The latest HSR Parallel Checker supports C# 7.2 with an improved analysis. The previously lacking analysis of LINQ expressions has now been added, amongst other specific extensions and refinements.

Notice: Microsoft, Visual Studio, and Visual Basic are either registered trademarks or trademarks of Microsoft Corporation in the United States and/or other countries.

All trademarks, trade names etc. are the property of their respective owners.

HSR, HSR Parallel Checker, and the contributors DO NOT have any affiliation with any mentioned trademark holders.