Receive instant email notices when your website becomes unavailable. Detailed uptime statistics and performance reports also provided.

• Free

Web site monitoring service that tests website availability and performance, and alerts the webmaster of downtime. It also provides FTP, HTTP, POP3, SNMP, HTTPS, SMTP, IP and DNS server monitoring.

Tells you when a web site is down or new content has been posted. Easy and simple to use with email notification. Includes weekly and monthly reports and instant setup.

• $6.95/mo

A remote website, web server and transaction monitoring service that offers multiple ways of notification, multiple locations around the world, customizable reports and monitoring intervals.

Have errors on your web-pages reported in an easy to read, and easy to report way. Completely free, and the required HTML code is generated by the sign-up procedure.

• Free

Website monitoring and uptime statistics for any website or URL from four different locations around the world.

• Free

Web site monitoring, notification, and performance verification of mission critical HTTP, HTTPS, FTP, and SMTP servers.

• $14.95

HostGuardian constantly monitors your site's presence.

• $10.95

24-hour website performance monitoring, global reporting and instant alerts.

The service tests the specified sites at the defined time intervals. If there are any problems, you will receive a notification with the description of the problem at the email address, SMS or AIM you specify.

• Free