Oh Dear
Oh Dear monitors the health of every website a team manages. Oh Dear checks uptime every minute from multiple locations and monitors SSL certificates, DNS records, domain expiration, scheduled tasks, broken links, mixed content, performance, Lighthouse, APIs, application health, ping, TCP ports, sitemaps, DNS blocklists and exposed ports.
Oh Dear sends alerts through email, Slack, Microsoft Teams, PagerDuty, Opsgenie and webhooks. Oh Dear includes branded status pages, client-ready reports, unlimited users and every monitoring feature on every plan. Oh Dear also includes AI-powered checks and SSO.
Mattias Geniar and Freek Van der Herten founded Oh Dear in Belgium in 2018. Oh Dear stores monitoring data in the EU and supports GDPR requirements. Oh Dear offers a 10-day trial with every feature and requires no payment information.
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Visual Sentinel
Visual Sentinel is a six-layer website monitoring platform for public websites, web applications, APIs, and client portfolios. It combines HTTP uptime, performance and Core Web Vitals, SSL certificate and domain expiry, DNS change detection, rendered browser screenshot comparisons, and critical content assertions. Visual Sentinel is designed to catch failures that ordinary ping monitors miss, including blank renders, missing CTAs, broken layouts, defacement, injected content, and unexpected page changes that still return 200 OK. Incident records keep the response, timeline, and visual evidence together. Teams can alert through email, Slack, Discord, Telegram, WhatsApp, Microsoft Teams, PagerDuty, Opsgenie, webhooks, and browser push according to plan. Additional features include server monitoring, API monitoring, status pages, client reports, Google and Cloudflare integrations, an Android companion, REST API, and MCP tools.
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Relvato
Relvato is a website monitoring and regression-testing service that rechecks site functions in a real browser, including uptime, sign-up and login flows, checkout, page speed, search visibility, security and visual changes. Public-page monitors work with websites across different platforms; a WordPress plugin adds event-triggered checks for WordPress and WooCommerce updates and authenticated flows. Relvato can rerun checks after GitHub deployments and connect Google Search Console and Bing Webmaster Tools for search-performance signals. Reports and alerts identify failures and associated changes, while optional AI-assisted suggestions can help explain issues and propose fixes. Additional monitoring covers SSL, DNS, broken links, email delivery, accessibility, cookie consent and legal pages. Plans include a free tier and paid subscriptions for site owners and agencies managing multiple sites.
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Pingvera
Pingvera is a website monitoring service for web agencies, studios and freelancers managing client sites. It brings multiple websites into one dashboard and checks availability, SSL certificates, domain expiry, broken links, suspicious redirects and search-indexing settings. Teams can configure form checks that submit test leads and verify email delivery when that check is configured, monitor WordPress health, and collect server metrics through an optional one-way agent. Alerts can be routed to email, Slack, Telegram or webhooks, while public status pages and incident history help teams share service status with clients. Paid plans add WordPress diagnostics, white-label branding and scheduled reports; the Business plan offers on-premises licensing on request. A free plan covers up to five sites, and paid tiers support larger portfolios. Check intervals start at one minute.
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