Sentinel monitors websites and infrastructure from outside, checking services across multiple global regions. Its checks cover 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 helps determine when to flag an outage. Alerts can reach email, SMS, Slack, Discord, Telegram, Microsoft Teams, and webhooks. Sentinel also lists GitHub, Terraform, PagerDuty, command-line access, and MCP connections among its integrations. MCP lets Claude, ChatGPT, and other compatible agents ask questions about monitors and help with incident triage. Customizable status pages and incident history are available, with page limits and features depending on the plan. Sentinel is designed for digital agencies, freelance developers and designers, and SaaS teams managing sites. The Free plan includes up to 10 monitors, five-minute checks, and one public status page. The pricing note says paid access starts at $12/mo and lists a 14-day trial; named monthly plans are Starter at 14.00 USD, Pro at 29.00 USD, and Business at 79.00 USD. A downloadable macOS menu bar app requires macOS 13.0 or later and a read-only API token.
Who it is for
Sentinel suits agencies, freelance developers and designers, and SaaS teams responsible for one or more sites. Its multi-region checks, alert channels, status pages, and incident history support teams that need to monitor services and communicate incidents.
What is good
- Checks cover uptime, certificates, DNS, domains, page keywords, APIs, ports, and jobs.
- Checks run from four regions as often as every 30 seconds.
- Alerts reach email, SMS, Slack, Discord, Telegram, Teams, or webhooks.
- Customizable status pages include incident history.
- MCP access lets compatible AI agents query monitors and assist with incident triage.
What to know first
- Free checks run every five minutes and cover up to 10 monitors.
- Free includes one public status page.
- The macOS app requires macOS 13.0 or later and a read-only API token.
Verdict
Choose Sentinel if you need multi-region website and infrastructure monitoring with broad checks, alerts, and status pages. The Free plan covers up to 10 monitors, while paid monthly plans add capacity and features; check the plan limits that fit your monitor and status-page needs.
Get started with Sentinel
- Open https://sentinel.rootstuff.io/.
- Choose the Free plan or review the paid plans and 14-day trial.
- Set up monitors for the services and checks you need.
- Choose alert channels such as email, Slack, or webhooks.
- Optionally download the macOS menu bar app; it requires macOS 13.0 or later and a read-only API token.
What the free plan stops at
The Free plan allows up to 10 monitors, checks every five minutes, and one public status page. The listed Starter plan allows up to 25 endpoints, checks every minute, and five client status pages; status-page limits and features depend on the plan.
Questions about Sentinel
Is there a free plan?
Yes. Free includes up to 10 monitors, five-minute check intervals, and one public status page.
What does Sentinel cost?
The pricing note says paid plans start at $12/mo. Listed monthly plans are Starter at 14.00 USD, Pro at 29.00 USD, and Business at 79.00 USD.
Is a free trial available?
Yes. The pricing note lists a 14-day trial.
Which platforms does Sentinel support?
The listed platforms are API, extension, macOS, and web. Its downloadable macOS menu bar app requires macOS 13.0 or later.
What alert channels and integrations are listed?
Alert channels include email, SMS, Slack, Discord, Telegram, Microsoft Teams, and webhooks. Other listed integrations include GitHub, Terraform, PagerDuty, command-line access, and MCP for compatible AI agents.
Who makes Sentinel?
Adam Balée identifies himself as Sentinel’s founder and developer. He says Rootstuff is based in West Chester, Pennsylvania.
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
