Checkmate

Checkmate positions itself as the self-hosted, open-source alternative to hosted monitoring services such as UptimeRobot, Pingdom and Better Uptime, for teams that want their monitoring data on their own infrastructure.

• Self-hosted: you own the data and the deployment, with no per-monitor SaaS fees.
• All-in-one checks: uptime, ping, port, SSL, Docker, page speed and hardware metrics together.
• Status pages included: public status pages with multiple themes, built in.
• Many notification channels: Slack, Discord, Telegram, PagerDuty, Teams, webhooks, email and SMS.
• Runs anywhere: Docker, Kubernetes, small home devices and one-click hosting platforms.

• Uptime monitoring over HTTP, plus ping, port and SSL certificate checks
• Docker container monitoring and game server status
• Page speed monitoring and JSON query monitoring
• Infrastructure monitoring of CPU, memory, disk and network via the Capture agent
• Response-time tracking with real-time visual dashboards
• Public status pages with four themes
• Notifications to email, webhooks, Discord, Slack, PagerDuty, Teams, Telegram and SMS
• Scheduled maintenance windows and incident management
• Support for 16+ languages
• Docker and Kubernetes (Helm) deployment, Raspberry Pi friendly, AGPL-3.0 licensed

Monitoring is one of the first things a team needs and one of the easiest to end up renting. Hosted services are quick to set up, but they charge per monitor, keep your availability data on their platform, and often gate status pages or integrations behind higher tiers.

Checkmate gives teams the same capability without those constraints. By self-hosting, you keep monitoring data on your own infrastructure, avoid per-monitor pricing, and get uptime, infrastructure metrics, status pages and a long list of alert channels in a single open-source app. For DevOps engineers and sysadmins who want full coverage and full control, it is a practical way to know the moment something breaks, on their own terms.