Sentinel monitors websites and infrastructure from multiple regions, checking uptime, SSL certificates, DNS records, domain expiry, page keywords, JSON and API responses, ping, TCP ports, and heartbeat or cron jobs. Checks can run every 30 seconds from four regions, and regional consensus is used before Sentinel flags an outage. Alerts are available through email, SMS, Slack, Discord, Telegram, Microsoft Teams, and webhooks. The platform also offers customizable status pages and incident history, with limits and features depending on the plan. Its integrations include GitHub, Terraform, PagerDuty, command-line access, and MCP connections that let compatible AI agents query monitors and assist with incident triage. The Free plan includes up to 10 monitors, five-minute checks, and one public status page. The pricing note lists paid access from $12/mo and a 14-day trial; listed monthly plans include Starter at 14.00 USD, Pro at 29.00 USD, and Business at 79.00 USD. A macOS menu bar app requires macOS 13.0 or later.
Who it is for
Sentinel is aimed at digital agencies, freelance developers and designers, and SaaS teams managing one or more sites. It suits teams that want multi-region monitoring, multiple alert channels, or status pages.
What is good
- Monitors websites and infrastructure across four regions
- Checks can run every 30 seconds
- Alerts include email, SMS, and collaboration channels
- MCP integration lets compatible agents query monitors
- Free plan includes up to 10 monitors
What to know first
- Free plan checks run every five minutes
- Free plan includes only one public status page
- macOS app requires macOS 13.0 or later
- Status-page limits and features depend on plan
Verdict
Sentinel covers a wide range of website and infrastructure checks, with multi-region outage confirmation and several alert options. Its free tier provides a starting point, while status-page features and limits vary by plan.
Sentinel plans and pricing
All plansCompared on API monitoring tools
- Free plan
- Yes
- Paid from
- $12/mo
- Response assertions
- Yes
- Multi-region checks
- Yes
- Monitor limit
- 25 monitors
- Incident workflows
- Yes
