FourSight - Website and Systems Monitoring and Alerting - Running a Commercial SaaS? FourSight includes 25 commercial-safe monitors — built for revenue-generating apps from day one. HTTP, DNS, SSL, port, keyword and domain checks — from 4 global regions at configurable intervals. Alerts via email, Slack, webhooks and SMS. Incident timelines, maintenance windows, and branded status pages, all from one dashboard.