Uptime Robot: Free website monitoring, supports 50 sites, once every 5 minutes

Uptime Robot, founded in 2010, mainly provides website monitoring. In January 2015, it began to provide a paid version. The free version supports 50 sites, detects it every 5 minutes, and saves logs for 2 months. The paid version supports 50 sites, detects once every 1 minute, saves logs for 24 months, provides 20 SMS notifications per month, and pays a monthly payment of US$5.5.

There are many monitoring points, check: https://uptimerobot.com/locations.php.

Monitoring types include http(s), ping, keywords, ports, etc.

SMS notifications can be purchased individually at prices of 50 messages/$15, 100 messages/$25, 250 messages/$55, and 500 messages/$100. Support RSS, API, etc.

Uptime Robot official website: https://uptimerobot.com/pricing

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