Sentinel
Ranked in API Monitoring Tools·Free plan·paid from $14/mo
About
Sentinel monitors websites and infrastructure from multiple regions, checking for service and configuration changes. Checks cover uptime, SSL certificates, DNS records, domain expiry, page keywords, JSON and API responses, ping, TCP ports, and heartbeat or cron jobs. They can run as often as every 30 seconds across four regions, and Sentinel uses regional consensus before flagging an outage. Alerts can be sent by email, SMS, Slack, Discord, Telegram, Microsoft Teams, or webhooks. Customizable status pages and incident history are available, with page limits and features depending on the plan. Integrations include GitHub, Terraform, PagerDuty, command-line access, and MCP access for AI agents; the MCP connection lets Claude, ChatGPT, and other compatible agents query monitors and support incident triage. A free plan includes up to 10 monitors, five-minute checks, and one public status page. The pricing note lists paid access from $12/mo, while listed monthly plans are Starter at 14.00 USD, Pro at 29.00 USD, and Business at 79.00 USD. A 14-day trial is available. The downloadable macOS menu bar app requires macOS 13.0 or later and a read-only API token.
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 looking for multi-region monitoring, alert integrations, or MCP access to monitors.
What is good
- Checks run across four regions with regional consensus.
- Monitors uptime, certificates, DNS, APIs, ports, and more.
- Alerts include email, SMS, and several team platforms.
- MCP access supports monitor queries and incident triage.
- Free plan includes 10 monitors and one public status page.
What to know first
- Free checks run every five minutes.
- Free plan is limited to 10 monitors.
- macOS app requires macOS 13.0 or later and a read-only token.
- Customer data is stored on Hetzner servers in Ashburn, Virginia.
Verdict
Sentinel brings multi-region checks, several alert routes, status pages, and developer integrations together for site operators. The free plan offers a starting point, while check frequency and status-page allowances vary by plan.
Compared on API monitoring tools
- Free plan
- Yessentinel.rootstuff.io
- Paid from
- $12/mosentinel.rootstuff.io
- Response assertions
- Yessentinel.rootstuff.io
- Multi-region checks
- Yessentinel.rootstuff.io
- Monitor limit
- 25 monitorssentinel.rootstuff.io
- Incident workflows
- Yessentinel.rootstuff.io
Facts
- Product
- Sentinel is an outside-in website and infrastructure monitoring platform that checks services from multiple global regions.sentinel.rootstuff.io · 7 Oct 2026
- Checks
- It monitors uptime, SSL certificates, DNS records, domain expiry, page keywords, JSON/API responses, ping, TCP ports, and heartbeat or cron jobs.sentinel.rootstuff.io · 7 Oct 2026
- Multi-region
- Checks can run as often as every 30 seconds from four regions, with regional consensus before Sentinel flags an outage.sentinel.rootstuff.io · 7 Oct 2026
- Alerts
- Alert channels include email, SMS, Slack, Discord, Telegram, Microsoft Teams, and webhooks.sentinel.rootstuff.io · 7 Oct 2026
- Integrations
- The integrations page lists GitHub, Terraform, PagerDuty, command-line access, and AI assistants through MCP, alongside its alert channels.sentinel.rootstuff.io · 7 Oct 2026
- Status pages
- Sentinel offers customizable status pages and incident history, with plan-dependent page limits and features.sentinel.rootstuff.io · 7 Oct 2026
- AI access
- The MCP integration connects Claude, ChatGPT, and other MCP-compatible agents to monitors for questions and incident triage.sentinel.rootstuff.io · 7 Oct 2026
- Target users
- Sentinel says it is designed for digital agencies, freelance developers and designers, and SaaS teams managing one or more sites.sentinel.rootstuff.io · 7 Oct 2026
- Security
- The sub-processors page says customer data is stored on Hetzner servers in Ashburn, Virginia, while probe servers in Germany and Singapore perform checks without storing customer data.sentinel.rootstuff.io · 7 Oct 2026
- Payments
- Stripe processes payments, and Sentinel says Stripe collects and stores card details so Sentinel never sees full card numbers.sentinel.rootstuff.io · 7 Oct 2026
- Support
- The founder says Sentinel is built by one person and that customers who email support get him directly.sentinel.rootstuff.io · 7 Oct 2026
- Founder and location
- Adam Balée identifies himself as Sentinel’s founder and developer, and says Rootstuff is based in West Chester, Pennsylvania.sentinel.rootstuff.io · 7 Oct 2026
- Desktop app
- Sentinel offers a downloadable macOS menu bar app that requires macOS 13.0 or later and a read-only API token.sentinel.rootstuff.io · 7 Oct 2026
Company
- Founded
- The company timeline says Sentinel was founded in 2024 and launched in February 2026.sentinel.rootstuff.io · 7 Oct 2026
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Where it ranks on Inferse
Sources
- sentinel.rootstuff.io· checked 7 Oct 2026
- sentinel.rootstuff.io/features· checked 7 Oct 2026
- sentinel.rootstuff.io/integrations· checked 7 Oct 2026
- sentinel.rootstuff.io/pricing· checked 7 Oct 2026
- sentinel.rootstuff.io/sub-processors· checked 7 Oct 2026
- sentinel.rootstuff.io/about· checked 7 Oct 2026
- sentinel.rootstuff.io/mac-app· checked 7 Oct 2026