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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.
SimilarWeb - SimilarWeb.com is a website analysis tool that gives you analytics information for any website.
StatusCake - Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring
Countly - Product Analytics and Innovation. Build better customer journeys.
Better Uptime - We call you when your website goes down