content: HTML5 alternative to speedtest.net https://speedof.me/ - Warning: Has banner ads.  Some ISP's have been known to unthrottle your connection when you run speedtest.net https://www.youtube.com/watch?v=XbVAeOfk8wU  Quick copy paste from their page: Unlike other speed tests that require third party applications (plugins), SpeedOf.Me tests your Internet speed directly from your web browser not through Flash or Java Plug-ins with lots of overhead. SpeedOf.Me also downloads large contiguous sample files. This is what you usually do when downloading a webpage or media. This is while other speed test services download small chunks in parallel and do heavy adjustments to calculate your approximate speed. SpeedOf.Me utilizes several test servers (PoPs) in various locations which makes the test result more realistic. Other speed test services have a different approach about test server location. Some choose the nearest physical test server, probably inside your ISP. It seems illogical because the speed between you and the selected server is always higher than your real speed [for connecting] to the rest of the Internet. On the other hand, some speed test services use a single test server to test users' connection speed in all geographical locations. For example, imagine a user is in Asia or Australia while the test server is in the US. The result would be inaccurate again because the end user is very far away from the testing server. All of these make SpeedOf.Me the most accurate and realistic speed test among others. 