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Scripts and page chrome removed; this is what change detection compares.
New: Connect AI assistants via MCPConnect Sentinel to Claude, ChatGPT & AI agents with our MCP server Learn more 4 regions listening right now Website monitoring that sees what others miss. Your server can be healthy while your website is unreachable. Sentinel checks from four regions around the world to catch the problems your server can't see. 10 monitors free foreverNo card for the free plan14-day trial on paid plansCancel anytime Built for business Keep every opportunity online. Every sale, signup, lead, and customer starts with being online. Sentinel watches your websites and services around the clock, so your business is ready when they are. Start monitoring free Multi-region monitoring Know your business is reachable from around the world, not just from one server. Instant incident alerts Get the signal fast, so you can act before a small problem becomes a bigger one. SSL, DNS & domain monitoring Catch the quiet failures that can take customers offline without taking your server down. Status pages & incident history Keep customers informed when something does happen, with a clear record of what happened and when. See a live demo → Uptime & website monitoring Some failures don't look like downtime. A site can return 200 OK and still be broken. Sentinel watches uptime, SSL, DNS, APIs, content, cron jobs, ports and everything else your sites depend on. http Uptime monitoring Four regions agree before Sentinel wakes you up. Checks run as often as every 30 seconds, without false alarms from one bad vantage point. tls SSL certificates Alerts weeks before a certificate expires, and the moment a chain stops validating. dns DNS records Seven record types watched. Know the instant something changes. whois Domain expiry Registration dates tracked, with alerts well before a client's domain lapses. json API monitoring Send custom requests and assert on the JSON that comes back. Catch the broken API hiding behind a 200 OK. cron Heartbeats & cron A dead man's switch for scheduled jobs: your backup script or queue worker pings us after each run, and a missing ping opens an incident. Silence becomes a signal. icmp Ping Echo from every region for servers and devices that don't speak HTTP. tcp Port checks Connection checks for databases, mail, SSH, and anything listening on a port. html Keywords Verify content exists, or catch errors and defacements the moment they appear. public Status pages Branded pages, public or password-protected, so clients check uptime themselves. timeline Incidents Automatic timelines and resolution notes for smoother client updates. mcp AI assistant Connect Claude, ChatGPT, or any MCP agent. Ask "is anything down?" in plain language. The full list → Outside-in Monitoring One check, four questions. Every visit has to clear four hurdles before your customer sees a single pixel. Can the world find you? dns Name resolution is the first thing to fail when a registrar lapses, a record changes, or a nameserver misbehaves. Can anyone connect? tcp A dead server, a firewall change, a full disk: connections get refused long before anyone sees an error page. Is the handshake trusted? tls An expired or misconfigured certificate turns every visitor away at the door, with a warning that looks like a hack. Is the app actually alive? ttfb Time to first byte is where slow databases, hung workers, and overloaded servers hide. Sentinel asks these questions about your monitors around the clock, from every region, and wakes you only when an answer changes. "It is by far the best monitor I've ever used. I could not recommend this product more." Marshall Oram · Interactive Director, Miller Design Works 5.0 / 5 on Product Hunt Sentinel has been reliable and easy to use for monitoring my website. I receive notifications as soon as my site goes down and when it's back online, and the reporting, status pages, SSL monitoring, and diagnostic tools make it a complete website monitoring solution.The distributed monitoring servers across the US, Europe, and Asia also give me confidence that outages are detected from multiple locations. Kur B.carrythemessage.com This is an essential tool for anyone who values their online presence. Sentinel gives me peace of mind with the assurance that I'm first to know about any website issues. Adam Lush · FounderTeamonics LLC Pricing Start free. Scale when you need to. Monitor up to 10 sites free. No credit card. Paid plans include a 14-day trial and scale with your portfolio. Free $0/mo Try it out. No credit card required. Up to 10 monitors Choose Free Starter $14/mo For freelancers managing a handful of client sites. Up to 25 monitors Choose Starter Pro $29/mo For agencies and teams managing client portfolios. Up to 100 monitors Choose Pro Business $79/mo For growing agencies with advanced client reporting. Up to 300 monitors Choose Business Full comparison → FAQ Fair questions. What is Sentinel? Sentinel is an outside-in website and infrastructure monitoring platform. It watches uptime, DNS, SSL, APIs, cron jobs and more from multiple regions around the world, so you know when something breaks before your customers do. What can Sentinel monitor? Uptime, SSL certificates, DNS records, domain expiration, page keywords, JSON/API responses, ICMP ping, TCP ports, and heartbeat/cron jobs. You can watch everything that keeps a client site online from a single dashboard. How quickly will I know when a site goes down? Checks run as often as every 30 seconds from four global regions, and an outage is confirmed by consensus across regions before you're alerted. That means you usually hear about downtime before your client does, without false alarms from a single bad region. How does Sentinel alert me? Alerts can be sent via email, SMS, Slack, Discord, Telegram, Microsoft Teams, and webhooks, so notifications land wherever your team already works. You control which channels and severities fire for each monitor. Who is Sentinel for? It's designed for digital agencies, freelance developers and designers, and SaaS teams who manage one or many sites and need to prove uptime to clients or customers. Can I give clients their own status page and reports? Yes. You can publish branded status pages so clients can check uptime themselves, and send scheduled uptime reports that demonstrate the value of your retainer or care plan. Is there a free plan or a free trial? Yes. There's a free plan you can start on with no credit card, and paid plans include a 14-day free trial. You can cancel anytime. How long does it take to set up? About 60 seconds per monitor. There's nothing to install, just enter a URL, pick how often to check, and choose where alerts should go. Know before they do. Set up your first monitor in about 60 seconds. Sentinel watches from four regions around the clock, so you're never the last to know. Start monitoring free Talk to us your session · 00:00:00 · 100.000% uptime