downornot.net is described as 'This service allows you to check whether a website is online or not. Is the website down for just you or for everyone?' and is a Uptime Monitor in the Network & Admin category. There are more than 25 alternatives to downornot.net, not only websites but also apps for a variety of platforms, including Android, iPhone, Self-Hosted solutions and Discord. The best alternative is Pingdom. It's not free, so if you're looking for a free alternative, you could try Freshping or Down For Everyone Or Just Me?. Other great sites and apps similar to downornot.net are Is It Down Right Now? (Free), Pingbreak (Free), Monitoshi (Free, Open Source) and Is it up? (Free, Open Source).
Pingdom web site monitoring and other infrastructure for you and instantly let you know when anything goes wrong. Measure uptime, downtime, and the performance of your website as experienced by visitors.
Pingbreak is an original and free monitoring service. Get notified through Twitter if your website is down. Pingbreak checks all of your websites each minute and alert you instantly by Direct Message (DM).
RapidSpike is a Digital Experience Monitoring Platform that interacts with your online platforms exactly as your customers do. It collects data across your digital ecosystem to help you improve a fast, reliable digital customer experience.