
UptimeRobot
Dashboard with 50 Monitors, Checked Every 5 Minutes, Totally Free. Monitor HTTP(s), Ping, Port and check Keywords. Get alerted via e-mail, SMS, Twitter, web-hooks or push. View uptime, downtime and response times.
StatusCake enables the visitor to track unlimited websites for free and get alerts when the site is down or having trouble. StatusCake also tracks performance over time so a webmaster can detect issues because they arise.
statuscake enables the visitor to track unlimited websites for free and get alerts when the site is down or having trouble. statuscake also tracks performance over time so a webmaster can detect issues because they arise.
the free plan offers checks every 5 minutes.
premium plans have "real browser" testing (where a webkit browser loads the complete page and reports on the performance) plus many other features: public status pages, fullsite scan, keyword monitoring, sms notifications
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