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Sentinel

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(2)5.0/5

Sentinel is website monitoring for agencies, freelancers and DevOps teams that are responsible for other people's uptime. It checks websites, APIs, SSL certificates, DNS, domain expiry, ports and cron jobs from four regions on three continents, and only opens an incident when the regions agree, so a blip at one vantage point never becomes a false alert. Alerts go where the team already works: email, SMS, Slack, Discord, Microsoft Teams, PagerDuty and signed webhooks, with routing per monitor and per severity and quiet hours. Every client gets a branded status page, uptime reports can be scheduled to an accounting or client inbox, and deploys from GitHub are drawn on the uptime charts beside the incidents that follow them. Monitoring can be managed as code through the API, a CLI and a Terraform provider, and from an AI assistant over MCP: ask what is down, triage an incident or add a monitor in conversation. The free plan covers 10 monitors with SSL, DNS and API checks included and no card required. Paid plans start at $14 a month.

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