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.
Netumo served me very well and everytime my website went down I was immediately notified. The new UI made it very easy to use and I enjoyed some of the features such as the new Response time reports. The free plan was the thing I liked the most as a student because I could test out my website for free using the majority of features available. The best website monitoring application for its value for money.