Uptime Kuma — #1 Alternative to PagerDuty

Name: Uptime Kuma
Rating: 4.94 (2176 reviews)

Beloved MIT-licensed self-hosted uptime monitor and public status page server

Monitors HTTP(s), TCP, DNS, Docker containers, Postgres, and gRPC endpoints down to 20-second intervals with 90+ notification integrations (Slack, Telegram, PagerDuty, SMS).

License: MIT · Pricing: Free & Open Source · Compare all PagerDuty alternatives · Official Website