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UptimeRobot - Free Website Uptime Monitoring
WebsiteSpeedAnalysis.com - Website Speed Analysis Tool
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
GTmetrix - GTmetrix is a free tool that analyzes your page's speed performance. Using PageSpeed and YSlow, GTmetrix generates scores for your pages and offers actionable recommendations on how to fix them.
Uptime Kuma - A fancy self-hosted monitoring tool.
PageSpeed Insights - PageSpeed is addon for ...