Downdetector.com

Downdetector.com is a website and tool, owned by Ookla, LLC, that detects whether a website is publicly temporarily unavailable or not. They have a feature which allows the user to search for any website and see if that website is down or not. They have a variety of graphs, such as the user reports, outages in the last 24 hours, and percentages of where the most reported problems occur more specifically.
On their main page, they have put some of the top used websites and have graphs below them that indicate whether the servers were down or not, such as the Navy Federal Credit Union, Spectrum, and Instagram.
Category:Websites
Category:Websites with the .com domain
Category:Websites registered in 2012
Category:Tool websites