VisualSentinel

VisualSentinel is external website monitoring built to catch failures that basic uptime checks miss. It combines six monitoring layers in one dashboard: uptime, performance, SSL certificates, DNS records, visual changes, and content integrity. A real browser captures screenshots and compares them pixel by pixel, so teams can catch broken layouts, missing elements, defacement, and changed checkout content even when the server still returns 200 OK. Use VisualSentinel for WordPress sites, ecommerce stores, SaaS applications, APIs, and agency client portfolios. It also includes API and endpoint checks, page-level synthetic monitoring, server health monitoring, public status pages, domain expiry reminders, maintenance windows, and incident timelines with screenshot evidence. Connect monitoring data through the REST API, webhooks, MCP server, and Claude skills. Send alerts through email, Slack, Discord, WhatsApp, Telegram, Microsoft Teams, PagerDuty, Opsgenie, webhooks, or Prometheus Alertmanager. Start free with three HTTP and SSL monitors. No credit card is required. Paid plans start at $6 per month and add visual, DNS, speed, server, and advanced alerting capabilities.