We alert you, before your customers do.
OnlineOrNot monitors your websites, web apps, and APIs, letting you know instantly if anything goes wrong.
Cost / License
- Freemium
- Proprietary
Application types
Platforms
- Software as a Service (SaaS)


UptimeLine is described as 'UpTimeLine checks that your websites are online and notifies you in case of downtime. Get up to 20 monitors checked every 5 minutes for free. All HTTP methods, custom body and headers, regex check on response body, SSL certificate monitoring and more' and is a Uptime Monitor service in the network & admin category. There are more than 50 alternatives to UptimeLine for a variety of platforms, including Web-based, SaaS, Self-Hosted, Windows and Linux apps. The best UptimeLine alternative is Uptime Kuma, which is both free and Open Source. Other great apps like UptimeLine are Better Stack, UptimeRobot, Tianji and Kener.
We alert you, before your customers do.
OnlineOrNot monitors your websites, web apps, and APIs, letting you know instantly if anything goes wrong.


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



PageMon.net: we're watching!
Boring checking tons of sites for updates? Read updates in your feed reader!.
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.




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.




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 & Web Application Monitoring
Dotcom-Monitor instantly alerts you when your website has problems. Detailed diagnostics enable you to take quick corrective action and see troubling trends, bottlenecks and intermittent issues clearly. We monitor externally, from the end.








With webcron you pay per request and you can choose the monitoring frequency to your linking. When your website goes down, webcron can send you either an email or a text message (SMS).

HowFast monitors offers website downtime monitoring with a check every single minute. It also helps you to track the response time of your server over time, telling you how much time was spent during DNS resolution, TCP connection, TLS handshake, HTTP send / wait / download, and...




Proactively monitor your websites and online services. Receive immediate notification when a problem is detected so you can quickly resolve the root cause and prevent potential escalation.



