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Website Grader - Grade your website's strengths and weaknesses in seconds.
PageSpeed Ninja - One-click page speed boost for WordPress
WebSite Auditor - The techie's SEO spider: find site issues other tools miss
Screpy - Screpy is a web analysis tool that can analyze all pages of your websites in one dashboard and monitor them with your team. It's powered by Lighthouse and it also includes some different analysis tools (SEO, SERP, W3C, Uptime, etc).
Treo - Treo is the page speed monitoring tool that helps your customers from obtaining a faster web experience.
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.