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, full-site scan, keyword monitoring, SMS notifications - https://www.statuscake.com/paid-website-monitoring/
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