UptimeRobot Service Monitor

UptimeRobot is a web-based uptime monitoring service that checks the availability of websites, servers, and online services at regular intervals and alerts users when downtime is detected. Founded in 2010 by Umut Muhaddisoglu in Turkey, the service has grown to monitor over 2 million monitors for hundreds of thousands of users worldwide. The platform is designed to be simple, reliable, and affordable, with a generous free tier that makes professional-grade monitoring accessible to everyone. Key features: monitor types: HTTP(s) monitoring (check if a website returns a 2xx or 3xx status code), keyword monitoring (check if a specific keyword appears or disappears on a page), ping monitoring (ICMP ping to check server availability), port monitoring (check if specific TCP ports are open, including HTTP, HTTPS, SMTP, FTP, SSH, DNS, and custom ports), and cron job monitoring (heartbeat monitoring that alerts if a scheduled task fails to check in). Check intervals: free tier checks every 5 minutes. Paid plans offer 1-minute, 30-second, and even 15-second intervals for near real-time monitoring. Alert contacts: send notifications via email, SMS, voice call, push notifications (via mobile app for iOS and Android), Slack, Discord, Telegram, Microsoft Teams, webhooks, and custom integrations. Multiple contacts can be assigned to each monitor with escalation policies. Status pages: create public or password-protected status pages showing real-time service status, uptime history, and incident reports. Custom branding with logos and colors. Maintenance windows: schedule planned downtime so monitors don't trigger false alerts during maintenance. Sub-account management: team members with different access levels. API: RESTful API for programmatic monitor management. SSL certificate monitoring: alerts before certificates expire. Response time monitoring: track and chart response times over time. Node.js. Proprietary with free tier.