The Official Xitoring app. The free plan includes monitoring for 2 Servers + 8 Uptime Checks + 1 SSL Check
Features:
- Uptime monitoring (Ping, HTTP, API, DNS, FTP, Mail, Heartbeat, Cronjob)
- SSL monitoring
- 1 minute interval
- Linux Server Monitoring
- Windows Server Monitoring
- Monitor your server software (Webserver, databases, Docker, etc.)
- Public Status page
- over 15 notification channels included (Email, WhatsApp, SMS, Telegram, Pagerduty, and more!)