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Sentinel

sentinel.rootstuff.io

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Spec score 8.8 #4 of 27 in API Monitoring Tools

What it is

Sentinel monitors websites and infrastructure from outside the services it checks, including across multiple 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, with regional consensus used before an outage is flagged. Alerts can go to email, SMS, Slack, Discord, Telegram, Microsoft Teams, or webhooks. Integrations include GitHub, Terraform, PagerDuty, command-line access, and MCP connections that let compatible AI assistants query monitors and help with incident triage. Customizable status pages and incident history are available, with limits that vary by plan. 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 are Starter at $14 a month, Pro at $29 a month, and Business at $79 a month. A macOS menu bar app requires macOS 13.0 or later.

Spec sheet

What it does
Sentinel is an outside-in website and infrastructure monitoring service for uptime, certificates, DNS, APIs, jobs and related checks.Read 15 Oct 2026 · sentinel.rootstuff.io
Product
Sentinel is an outside-in website and infrastructure monitoring platform that checks services from multiple global regions.Read 7 Oct 2026 · sentinel.rootstuff.io
Integrations
GitHub deploy markers, Terraform, PagerDuty, a CLI and MCP-based AI assistants are supported; Zapier and Datadog are listed as coming soon.Read 15 Oct 2026 · sentinel.rootstuff.io
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.Read 7 Oct 2026 · sentinel.rootstuff.io
Support
The founder says Sentinel is built by one person and that customers who email support get him directly.Read 7 Oct 2026 · sentinel.rootstuff.io
Founded
The company timeline says Sentinel was founded in 2024 and launched in February 2026.Read 7 Oct 2026 · sentinel.rootstuff.io
Maker
Sentinel is a product of Rootstuff, founded by Adam Balée; the company identifies West Chester, Pennsylvania as its location and says Sentinel began in 2024.Read 15 Oct 2026 · rootstuff.io
AI access
The MCP integration connects Claude, ChatGPT, and other MCP-compatible agents to monitors for questions and incident triage.Read 7 Oct 2026 · sentinel.rootstuff.io
Alerts
Alert channels include email, SMS, Slack, Discord, Telegram, Microsoft Teams, and webhooks.Read 7 Oct 2026 · sentinel.rootstuff.io
API authentication and limits
API calls use bearer tokens, and standard requests are limited to 120 per minute with no daily or monthly quota.Read 15 Oct 2026 · sentinel.rootstuff.io
API base and versioning
The REST API uses https://sentinel.rootstuff.io/api/v1 and promises additive-only changes within version 1.Read 15 Oct 2026 · sentinel.rootstuff.io
API monitoring
Custom HTTP requests can assert JSON response paths and values to detect silent API failures.Read 15 Oct 2026 · sentinel.rootstuff.io
Checks
It monitors uptime, SSL certificates, DNS records, domain expiry, page keywords, JSON/API responses, ping, TCP ports, and heartbeat or cron jobs.Read 7 Oct 2026 · sentinel.rootstuff.io
CLI
The CLI is installed with npm, requires Node.js 18 or newer, supports CI/CD workflows and manages monitors, incidents, teams, webhooks and status pages.Read 15 Oct 2026 · sentinel.rootstuff.io
Company stack
Rootstuff's case study says Sentinel is built with Laravel, Vue and Inertia and operates checks from multiple regions.Read 15 Oct 2026 · rootstuff.io
Data retention
Terms state that monitoring data is retained for 30 days on Free, 90 days on Pro and one year on Business.Read 15 Oct 2026 · sentinel.rootstuff.io
Desktop app
Sentinel offers a downloadable macOS menu bar app that requires macOS 13.0 or later and a read-only API token.Read 7 Oct 2026 · sentinel.rootstuff.io
DNS monitoring
Sentinel watches seven DNS record types and alerts when records change.Read 15 Oct 2026 · sentinel.rootstuff.io
Documentation depth
Documentation includes getting-started guides, monitor concepts, integrations, CLI instructions, API references, pagination, errors, rate limits and troubleshooting.Read 15 Oct 2026 · sentinel.rootstuff.io
Founder and location
Adam Balée identifies himself as Sentinel’s founder and developer, and says Rootstuff is based in West Chester, Pennsylvania.Read 7 Oct 2026 · sentinel.rootstuff.io
Heartbeat and cron
Push heartbeat and cron monitors open incidents when expected job pings are missing or report failure.Read 15 Oct 2026 · sentinel.rootstuff.io
Hosted service
The MCP server documentation describes Sentinel as a hosted service and says its server code is not open source.Read 15 Oct 2026 · sentinel.rootstuff.io
Keyword monitoring
Keyword checks verify required page text or detect unwanted error and defacement content.Read 15 Oct 2026 · sentinel.rootstuff.io
Licence
The hosted Sentinel service is proprietary, while the published Sentinel CLI is open source under the MIT licence.Read 15 Oct 2026 · sentinel.rootstuff.io
Limit: availability guarantee
Terms say Rootstuff strives for 99.9% uptime but does not guarantee uninterrupted service and is not liable for missed incidents or monitoring delays.Read 15 Oct 2026 · sentinel.rootstuff.io
Limit: compliance
Slack's security listing says the app is not HIPAA compliant, does not support SAML, has no dedicated security team, no vulnerability disclosure program and no bug bounty.Read 15 Oct 2026 · slack.com
Limit: macOS desktop coverage
The maker's blog states that the menu-bar app is macOS-only, with no Windows or Linux build at that time.Read 15 Oct 2026 · sentinel.rootstuff.io
Limit: webhook tier
Custom webhooks are documented as a Pro and Business feature, so they are unavailable on Free and Starter.Read 15 Oct 2026 · sentinel.rootstuff.io
macOS app
The free menu-bar app is version 1.0.5, requires macOS 13 or later, uses a read-only API token and refreshes from 15 seconds to five minutes.Read 15 Oct 2026 · sentinel.rootstuff.io
MCP integration
Sentinel exposes 26 MCP tools for monitoring reads and operational writes, with OAuth or bearer-token connection methods.Read 15 Oct 2026 · sentinel.rootstuff.io
MCP plan limits
Read tools are available on plans with API access, while write tools require Pro or Business and on-demand URL checks require a paid plan.Read 15 Oct 2026 · sentinel.rootstuff.io
Multi-region
Checks can run as often as every 30 seconds from four regions, with regional consensus before Sentinel flags an outage.Read 7 Oct 2026 · sentinel.rootstuff.io
News: MCP registry
A July 7, 2026 post announced Sentinel's verified first-party listing in the official MCP Registry as io.rootstuff/sentinel.Read 15 Oct 2026 · sentinel.rootstuff.io
Notifications
Alert channels include email, SMS, Slack, Discord, Telegram, Microsoft Teams and webhooks.Read 15 Oct 2026 · sentinel.rootstuff.io
Payments
Stripe processes payments, and Sentinel says Stripe collects and stores card details so Sentinel never sees full card numbers.Read 7 Oct 2026 · sentinel.rootstuff.io
Ping and port checks
ICMP checks cover non-HTTP hosts and TCP checks test databases, mail, SSH and other ports.Read 15 Oct 2026 · sentinel.rootstuff.io
Rating on G2
The G2 Sentinel pricing listing displays a 5.0 out of 5 rating; the page does not state a review count.Read 15 Oct 2026 · g2.com
Security measures
The privacy policy states that Sentinel uses TLS in transit, encrypted password storage, security audits, cloud infrastructure and access controls.Read 15 Oct 2026 · sentinel.rootstuff.io
Server-error detection
Sentinel detects PHP, WordPress and SQL errors on pages that still return HTTP 200 responses.Read 15 Oct 2026 · sentinel.rootstuff.io
Slack data handling
Slack says Sentinel stores workspace and channel identifiers plus webhook URLs, not message content or member data, and encrypts sensitive values at the application layer.Read 15 Oct 2026 · slack.com
Slack hosting
Slack's listing identifies Hetzner as the hosting provider, with primary customer storage in Ashburn, Virginia and probe servers in Germany and Singapore.Read 15 Oct 2026 · slack.com
Slack permissions
Slack's marketplace listing says Sentinel requests permission only to post messages to channels selected by the installer and cannot read messages or browse the workspace.Read 15 Oct 2026 · slack.com
SSL monitoring
The service tracks certificate validity and warns before expiration or when certificate chains stop validating.Read 15 Oct 2026 · sentinel.rootstuff.io
Status pages
The product provides public or password-protected status pages and incident timelines.Read 15 Oct 2026 · sentinel.rootstuff.io
Target users
Sentinel says it is designed for digital agencies, freelance developers and designers, and SaaS teams managing one or more sites.Read 7 Oct 2026 · sentinel.rootstuff.io
Uptime monitoring
HTTP/HTTPS checks run from four regions as often as every 30 seconds, with multi-region consensus before an outage alert.Read 15 Oct 2026 · sentinel.rootstuff.io

Plans and prices

Free Free up to 10 monitors · 5-minute checks · uptime, SSL, DNS, domain, keyword, ping, port, JSON/API and server-error checks · 1 public status page · email, Discord and Telegram alerts · API, CLI, Terraform, MCP · macOS app Read 15 Oct 2026 · sentinel.rootstuff.io
Starter $14 a month Billed monthly up to 25 monitors · 1-minute checks · heartbeat/cron monitoring · Slack and Teams alerts · US/Canada SMS · 5 client status pages Read 15 Oct 2026 · sentinel.rootstuff.io
Pro $29 a month Billed monthly up to 100 monitors · Lighthouse audits · signed webhooks · one team with up to 5 members · 10 branded status pages · custom-domain status pages Read 15 Oct 2026 · sentinel.rootstuff.io
Business $79 a month Billed monthly up to 300 monitors · 30-second checks · PagerDuty · unlimited teams and members · unlimited status pages · client-ready uptime reports · priority support Read 15 Oct 2026 · sentinel.rootstuff.io

Every Sentinel plan and price →

Strong points and limits

Strong points

  • Checks cover websites, infrastructure, and scheduled jobs.
  • Checks run from four regions as often as every 30 seconds.
  • Alerts include email, SMS, and several team services.
  • Free plan includes up to 10 monitors.
  • MCP connects compatible AI agents to monitor data.

Limits

  • Free checks run at five-minute intervals.
  • Free plan includes only one public status page.
  • macOS app requires macOS 13.0 or later.
  • Plan status-page limits and features vary.

Who it suits

Sentinel is aimed at digital agencies, freelance developers and designers, and SaaS teams managing one or more sites. It also suits teams that want regional monitoring, status pages, and multiple alert channels.

Verdict

Sentinel combines a broad set of monitoring checks with multi-region confirmation and several alert options. The free plan offers a defined starting point, while status-page and monitoring limits depend on the selected plan.

Where Specifiction places it

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