The best alternatives to Checkeroni are Hyperping, Authbase, and DownStatus. If these 3 options don't work for you, we've listed a few more alternatives below.
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Downtime Monkey is an uptime monitoring tool that alerts you via email or SMS if your website goes down. 60 websites monitored every 3 minutes, totally free. SMS alerts to over 130 countries & 300 networks. Uptime stats and logs. Powerful Pro features including 1 minute checks, rate limiting & scheduling of alerts, and reasons for downtime.
Netumo is an uptime monitoring service that performs synthetic monitoring of web hosts and RESTful APIs. When Netumo detects an issues it notifies the end user using SMS, Twitter, Email, Telegram, MS Teams and/or Slack.
Monitor the uptime of all of your websites/servers, and know the moment any of them goes down, so you can quickly act and fix the problem, before the downtime gets to affect your users, SEO rankings, or revenue stream.