WCat 6.3 (x86)

Windows This is a Community Contributed Download

CategoryImprove Performance
Supported byForums
Works WithIIS 5.1, IIS 6, IIS 7
Documentation N/A
Updated onJune 6, 2011
Uploaded byMicrosoft


Web Capacity Analysis Tool (WCAT) is a lightweight HTTP load generation tool primarily designed to measure the performance of a web server within a controlled environment. WCAT can simulate thousands of concurrent users making requests to a single web site or multiple web sites. The WCAT engine uses a simple script to define the set of HTTP requests to be played back to the web server. Extensibility is provided through plug-in DLLs and a standard, simple API.


  • HTTP 1.0 and HTTP 1.1 capable
  • Supports IPv6
  • Multithreaded Support
  • Supports generating stress from multiple machines
  • Extensible through C plug-in DLLs
  • Supports Performance Counter integration
  • Measures throughput and response time
  • Supports SSL requests
  • NTLM Authentication request support
  • Easily supports testing thousand of concurrent users


  • Very light weight (low hardware requirements)
  • Extensible to handle any aspect of the HTTP request or response
  • Allows remote collection of perfmon data and registry


WCat 6.2 supports the following Operating Systems:

  • Windows XP
  • Windows Server 2003
  • Windows Vista
  • Windows Server Code-named "Longhorn"