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Website Grader - Grade your website's strengths and weaknesses in seconds.
Website Speed Ranker - Compare how fast your website loads vs your competitors
WebSite Auditor - The techie's SEO spider: find site issues other tools miss
Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.
Treo - Treo is the page speed monitoring tool that helps your customers from obtaining a faster web experience.
Progressive Tooling - Curated list of tools to improve web page performance