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.
Platforms
- Online




OnlineOrNot is described as 'We alert you, before your customers do' and is a Uptime Monitor service in the network & admin category. There are more than 50 alternatives to OnlineOrNot for a variety of platforms, including Web-based, SaaS, Self-Hosted, Linux and Android apps. The best OnlineOrNot alternative is Uptime Kuma, which is both free and Open Source. Other great apps like OnlineOrNot are Better Stack, UptimeRobot, Tianji and Pingdom.
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.




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



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.


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...




Pingbreak is an original and free monitoring service. Get notified through Twitter if your website is down. Pingbreak checks all of your websites each minute and alert you instantly by Direct Message (DM)







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.




SIMPLE Website monitoring. If your website goes down, shouldnt YOU be the first to know about it?
Performance monitoring simplified. Never let users see your website down or with bad loading speeds. Receive alerts & insights in real-time on health and performance.




Assertible is the easiest way to test and monitor your APIs and helps reduce bugs in web apps by providing tools to continuously validate endpoints and responses with a flexible interface to run your tests any time and place.




UptimeMate helps you to find technical issues on your websites and makes sure that you are the first to know.


