Your websites,
always watched.
Sentinel is an all-in-one monitoring and security platform that gives you complete visibility into the health, security, and performance of your websites. Think of it as a 24/7 security guard for your online presence.
More than just uptime monitoring
Unlike basic monitors that just ping your site, Sentinel provides deep, comprehensive monitoring across six critical modules. It's the difference between knowing your site is "up" and knowing your site is secure, fast, and properly configured.
24/7 Monitoring
Continuous checks from multiple global locations, every 30 seconds.
6 Modules
DNS, SSL, Security Headers, Uptime, Performance, and Observatory.
Instant Alerts
Email, SMS, and WhatsApp notifications the moment issues are detected.
Six monitoring modules, one dashboard
Each module provides deep insights into a critical aspect of your website's health and security.
DNS Monitoring
Monitors all DNS records — A, AAAA, MX, NS, TXT, CNAME, SOA, CAA. Alerts you within minutes of any unexpected changes.
- Record change detection
- Subdomain discovery
- DNSSEC validation
- Email security (SPF/DKIM/DMARC)
SSL/TLS Monitoring
Deep certificate analysis with expiry alerts 30, 14, and 7 days before. Validates full chain and protocol versions.
- Expiry tracking
- Chain validation
- Protocol checking
- HSTS preload status
Security Headers
Analyses HTTP security headers that protect users from XSS, clickjacking, and other attacks. Grades from A+ to F.
- CSP analysis
- HSTS checking
- X-Frame-Options
- Referrer-Policy
Uptime Monitoring
Global monitoring from multiple locations worldwide. Know when your site goes down before your customers do.
- 30-second intervals
- Multi-location checks
- Response time tracking
- Instant alerts
PageSpeed (Performance)
Google PageSpeed Insights integration measuring Core Web Vitals, FCP, TTI, and Speed Index.
- Core Web Vitals
- Mobile & Desktop scores
- Performance trends
- Lighthouse analysis
Observatory (Mozilla)
Mozilla's HTTP Observatory security scanner for comprehensive security analysis used by professionals worldwide.
- Industry-standard grading
- 12+ security checks
- Cookie security
- SRI validation
Who is Sentinel for?
Built for teams who need comprehensive monitoring without the enterprise complexity.
Web Agencies & Freelancers
Manage 10, 50, or 100+ client websites from one dashboard. Catch SSL expirations and DNS issues before your clients do.
IT Teams & DevOps
Track DNS changes, monitor SSL across all endpoints, and ensure security headers are properly configured across your entire estate.
E-commerce & SaaS
Downtime costs money. Know your site's health at a glance with uptime, performance scores, and instant alerts.
Security-Conscious Organisations
GDPR, PCI-DSS compliance monitoring. Track security headers, email authentication, and generate compliance reports.
Everything you need to monitor at scale
Beyond the six modules, Sentinel includes powerful features for teams and agencies.
DNS Zone Alerts
Instant alerts when any DNS record changes unexpectedly
SSL Expiry Reminders
30, 14, and 7-day warnings before certificates expire
Email Security
SPF, DKIM, DMARC monitoring to prevent spoofing
Performance Trends
Track speed scores over time, spot regressions
AI Security Advisor
Plain-English recommendations powered by AI
Incident Management
Track, acknowledge, and resolve issues professionally
Need help? We've got you covered.
Not sure what an incident means or how to fix it? Our Managed Service option gives you access to real people who can help you understand issues, prioritise fixes, and implement solutions.
- ✓Real human support, not chatbots
- ✓Help understanding technical issues
- ✓Guidance on implementing fixes
- ✓Priority incident response
- ✓Regular security reviews
Managed Service
Support by real people
"I don't have time to figure out what CSP headers are or why my DNS is misconfigured. Can you just fix it for me?"
Yes. That's exactly what our Managed Service is for. We monitor, we explain, we help you fix.
Ask About Managed ServiceYour websites deserve a guardian
Catch problems before your customers do. Maintain security compliance. Prove your value to clients. That guardian is Sentinel.