UptimeRobot is described as 'Monitor up to 50 sites with 5-minute intervals for free. Receive alerts by email, SMS, calls, and integrate with platforms for seamless updates' and is a very popular website monitoring tool in the network & admin category. There are more than 100 alternatives to UptimeRobot for a variety of platforms, including Web-based, SaaS, Self-Hosted, Windows and Linux apps. The best UptimeRobot alternative is Better Stack. It's not free, so if you're looking for a free alternative, you could try Better Stack or Uptime Kuma. Other great apps like UptimeRobot are Pingdom, Tianji, Kener and HetrixTools.
As of May 2015, Browsermob is dead.
"Website monitoring for the masses. From basic free plans to enterprise level solutions, BrowserMob has it all - try our FREE website monitoring performance test.".
Cachet is a simple to use and easy to manage status page system and can be easily installed and used to track third party service letting your users know what's going on.
United Kingdom
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).
Free SaaS service for Uptime Monitoring for web sites, hosting servers and ports & custom Status Pages.
Spain
EU
ServersUp.net can check a number of different services on different hosts to make sure those services are up and running. It will send alerts when the statuses change.
A simple self-hosted status page site with an API written in Django under the BSD license.
Unlimited monitors checked from multiple location every minute. Monitor any port or setup a "heartbeat" that works well for cron jobs or any service behind a firewall. Be alerted as soon as your service is offline via email or app integration.
United States
Reliable uptime monitoring, status pages and rapid alerting service designed with the needs of online businesses in mind.
Host Mon allows you to monitor up to 5 hosts completely free. Host Mon even sends offline and recovery emails for all monitored hosts and websites. There are embeddable uptime widgets you can use on existing websites as well.
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Instant status pages aggregate the status of all the services you depend on.
United States
