Checkmate vs DomainWarn

Checkmate is a free, open-source, self-hosted dashboard for monitoring infrastructure, service uptime, PageSpeed, and incidents. It checks HTTP, ping, TCP, gRPC, WebSocket, DNS, SSL, and more than 100 game server types. Its Capture agent reports server CPU, memory, disk, temperature, and network metrics, while PageSpeed monitoring tracks Lighthouse scores and Core Web Vitals over time. Public status dashboards can show per-service uptime and incident history with custom branding. Alerts can go to email, Slack, Discord, Telegram, Twilio SMS, Pushover, ntfy, Matrix, Rocket.Chat, PagerDuty, Microsoft Teams, and webhooks. The maker says metrics, logs, incidents, and user accounts remain in the database configured by the operator, with no phone-home or telemetry pipeline. Checkmate is licensed under AGPL-3.0 and can be installed with Docker Compose or Kubernetes/Helm; its image runs on x86, Apple Silicon, and Raspberry Pi. The maker says the API accepts JSON for bulk monitor setup and provides a REST API reference. The free plan includes all features, no monitor limits, self-hosting, and 12 alert channels. There is no one-click migration import or paid support tier.

DomainWarn monitors client domains for changes to websites, DNS, MX, SPF and DMARC, and brings checks and alerts into one dashboard. Its domain check runs 21 checks across website, email, DNS and registration, with area scores and an overall score. It detects record and name-server changes, checks them against a second name server, and displays old and new values. Related issues can be grouped into incidents, with reminders and one all-clear message after recovery.

The service supports 20 notification channel types, including email, Slack, Microsoft Teams, Discord and SMS. DNS integrations include Cloudflare, Hetzner DNS, IONOS, netcup, INWX and Amazon Route 53. It is available on the web, via API, and through WordPress, Shopware and Chrome extensions. The free plan is free with three domains, two members and seven days of history. Freelancer is €19 a month; Agency is €49 a month; Agency Pro is €99 a month. The service is offered to businesses, not consumers.