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Hyperping - Cheap uptime and performance monitoring with detailed reporting and flexible alerting
Smaller - Make your websites load faster
Suprvise - Know instantly when your sites are down.
Website Grader - Grade your website's strengths and weaknesses in seconds.
Oh Dear! - Website monitoring, without the hassle
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.