Monika is a command-line application to monitor every part of your web app using a simple YAML configuration file. Get alert notifications through SMTP, Discord, Slack, WhatsApp, and many more when your site is down but also when it's slow!.


Monika is a command-line application to monitor every part of your web app using a simple YAML configuration file. Get alert notifications through SMTP, Discord, Slack, WhatsApp, and many more when your site is down but also when it's slow!.


All-in-one server, uptime, and status page monitoring with built-in AIOps. One command auto-discovers 30+ services on Linux and Windows; 1-minute checks, 20+ alert channels, and an MCP server for Claude, Cursor, and other AI agents. Free for 2 servers and 8 checks.




We alert you, before your customers do.
OnlineOrNot monitors your websites, web apps, and APIs, letting you know instantly if anything goes wrong.


Free open-source website monitoring software, easy to set up and use for monitoring web sites. You can monitor single web pages, multiple web pages, pages in sitemap and even your whole web site using spider. You can check HTTP result codes and even contents of the checked pages.

BAG·Tower is a SaaS platform to monitor equipment, connected objects, applications, services, etc. BAG·Tower's simple interface that can be used by anyone on your team: developers, team managers, analysts or simple guests.




Phare is the all-in-one platform that covers everything you need to run high-quality production websites with uptime monitoring, analytics, security, incident management, and alerting.




NodePing Server Monitoring and Web Site Monitoring. Simple but powerful Internet service monitoring. Checks as frequent as once a minute.



Website uptime monitoring. Be notified by email when your site is down. Free and open source, monitor as many URLs as you want. You can hack it and host it yourself or use the official instance.




An uptime monitoring and status page platform for websites, APIs, servers, and Discord bots. Monitor HTTP, Ping, Port, SSL, and Discord services with real-time alerts via Discord, Slack, Telegram.

Status by Broos Action is a lightweight, cost-effective tool designed to help system owners monitor uptime and service health in real time. It offers customizable status pages, incident tracking, and performance analytics.




Self-hosted open-source observability in a single Go binary: error tracking, distributed tracing, metrics, profiling and uptime monitoring, accepting events from stock Sentry SDKs and OTLP.



Monitor your email alerts service and detect that it's stopped working before your users complain.


Developer infrastructure primitives under one API key — cron job scheduling, uptime monitoring, heartbeat checks, email verification, and auto-generated status pages. Built for serverless apps on Vercel, Railway, Render, and Fly.io. Go, Node.js, and Python SDKs + MCP server included.




Simplified Monitoring for Complex Applications Achieve deep observability, strong correlation and improved resolution time for Cloud Native Applications.




Web service for accurate and anonymous monitoring of web pages using CSS Selectors. MonitorWiz will detect even the smallest changes 100% accurately – it’s all down to setting up good CSS Selectors that precisely define monitored areas.



🔥 Free & open source under MIT! Über fast, backwards compatible (IE8+), tiny, and simple status page built with Hugo. Compatible with Netlify & GitHub Pages. https://github.com/mistermantas/cstate.

Free SaaS service for Uptime Monitoring for web sites, hosting servers and ports & custom Status Pages.

Uptime Monitor monitors your resources using HTTP/HTTPS (highly customizable), TCP, or Ping protocols. It supports multiple notification channels such as SMS, email, Slack, and Discord. In addition, Uptime Monitor can host status pages on your own domain for free.


Website monitoring service that offers a comprehensive free plan with:
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Statsignal is the simplest and most cost-effective way to monitor your website or server and publish a status page of your system. No plans, pay as you go. Free monitors available.




Middleware is a full stack cloud observability platform to bring all metrics, logs, and traces in one unified timeline to debug issues faster.




At UptimeObserver.com, we specialize in comprehensive website monitoring and web infrastructure monitoring. Our mission is to empower website owners and administrators with the tools they need to ensure their online presence remains consistently reliable and responsive.

Kuvasz ['kuv?s], an open-source, self-hosted uptime & SSL monitoring service with status pages, designed to help you keep track of your websites and services. It provides a modern, user-friendly interface, a powerful REST API, and supports multiple notification channels like...




Is it down can check if a website is down or is it just your PC that can not access it. This AJAX website in United Kingdom can check for websites with time out errors, offline servers, dns errors, network issues, scheduled downtime, unscheduled down time and deleted domain...



RapidSpike is a Digital Experience Monitoring Platform that interacts with your online platforms exactly as your customers do. It collects data across your digital ecosystem to help you improve a fast, reliable digital customer experience.



