Optimizely

    Visitors:

    0.75M

    Price:

    Starting $50000.00/year

    Feature Management, Personalization, A/B Testing, ALM Software Suites, and Configuration Management

    VWO Testing

    Visitors:

    0.46M

    Price:

    Contact them

    AB testing, Website Tests, User experience, Reporting tool, Conversion rate optimization, Landing pages

    Google PageSpeed Insights

    Visitors:

    No Info

    Price:

    Free

    SEO, Page speed testing, Website speed testing, Diagnose performance issues, Discover what your real users are experiencing

    Pingdom

    Visitors:

    0.88M

    Price:

    Free; Starting $10 per month

    Website Monitoring service, Uptime Performance, Customers Interface, Reports, Site Speed Platform

    GTmetrix

    Visitors:

    2.7M

    Price:

    Free; Starting $13 per month

    Web optimization, Loading speed, Page speed, Website performance, Yslow score, Reports, Page load time