UpStat is an uptime monitoring tool built for developers. Get alerted instantly via WhatsApp or email when your site or API goes down, before your users notice. Features: HTTP/TCP monitoring, SSL & DNS checks, public status pages with custom branding, synthetic monitors, dependency map, post-mortem reports, npm SDK for internal health checks, Go CLI, webhook support, and Slack integration. Free plan avaliable. Built for Brazilian devs but works for everyone.