Alternatives to Yahoo! YSlow for all platforms with any license

  • Google Lighthouse

    Lighthouse is an open-source, automated tool for improving the quality of web pages. You can run it against any web page, public or requiring authentication.

    Free Open Source Mac Windows Linux

    Google Lighthouse icon
  • WebPagetest

    Run a free website speed test from multiple locations around the globe using real browsers (Firefox, IE, Chrome, Android and iOS) and at real consumer connection speeds....

    Free Open Source Web

    No features added Add a feature

    WebPagetest icon
  • Yellow Lab Tools

    Yellow Lab Tools checks a website for both it's performance and the quality of the HTML, CSS and JavaScript code. The application is available online and as...

    Free Open Source Web

    No features added Add a feature

    Yellow Lab Tools icon
  • SitePerformanceTest.com

    Perform and explore an in-depth website analysis. Generate a comprehensive report to evaluate performance and usability ratings complete with improvement recommendations.

    • Discontinued No more site performance test. Website unavailable.

    Free Web

    No features added Add a feature

    SitePerformanceTest.com icon
  • SiteSpeedTester.com

    Evaluate the load speed and usability for any webpage. Generate a report to determine website performance with detailed efficiency recommendations and usability...

    Free Web

    SiteSpeedTester.com icon
  • Calibre

    Performance monitoring that gives the page speed insights you need to improve customer experience.

    Commercial Web

    No features added Add a feature

    Calibre icon
  • cutestat

    Website Stats and Valuation. CuteStat.com is a web service for Website Owners, Webmasters and General Internet Users to retrieve information related with Domain Name, IP...

    Free Web

    cutestat icon
  • Site Relic

    Site Relic is a FREE toolbox where you can test your website for performance & security in seconds without user registration.

    Freemium Web

    No features added Add a feature

    Site Relic icon
  • KeyCDN Tools

    Website speed test, DNS lookup service incl EDNS client subnet, fast geolocation for IP or hostname, HTTP response headers, FREAK attack tester and more.

    Free Web

    KeyCDN Tools icon

Platforms

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