AlertSite
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Free plan offers: Site check once an hour, performance tracking and email notification.
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GlobalSite Monitor
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Site accessibility verification for 1 URL; Immediate notification of site outages; 1 notification recipient; Site checked up to 3 times per hour; Free for one year .
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WebPartner
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WebPartner is a free service that monitors site performance and provides online business managers prompt email and/or pager notification of problems such as "site not found" and "slow response time", as well as valuable benchmark comparisons against other leading industry and competitive sites. It can check three specific URLs every 15 minutes.
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@watch
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Uptime monitoring service. Offers a free 30 day trial during which it will check your server every 2 hours. Pay service can check your server up to every 2 minutes.
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HumanClick
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Humanclick is a free service for websites. It allows monitoring who is on the site, and free chat between web site operator and all visitors to the site.
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iServerWatch
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24 hour monitoring of unlimited number of URLs every 10 minutes for just $9.99. Instant notification of downtimes via email.
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SiteProbe
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A service that will check your server status hourly for free or more often than that for a small fee. If the server goes down you will be notified. You either have to receive monthly reports or login once a month to avoid being deleted.
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Alertra WebSite Monitoring
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Receive instant notification via phone call, e-mail, SMS or AOL instant message anytime your site goes down. Price depends on frequency. Hourly checks cost $ 0.99 to check every minute will cost $59.99.
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NodeBlue.net
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Provides affordable website monitoring, alerting, and downtime tracking. Free trial for new signups. 4 tests cost 1 penny! (that's only $7.20/month for testing every 15 minutes)
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