Fast.com is described as 'Powered by Netflix, Fast.com estimates your current download speed. You will generally be able to get this speed from leading internet services, which use globally distributed servers' and is a popular Internet Speed Test App in the Network & Admin category. There are more than 25 alternatives to Fast.com, not only websites but also apps for a variety of platforms, including Android, Windows, iPhone and Mac. The best alternative is Speedtest by Ookla, which is free. Other great sites and apps similar to Fast.com are LibreSpeed (Free, Open Source), SpeedOf.Me (Free), nPerf (Free) and speedtest-cli (Free, Open Source).
SpeedOf.Me is an HTML5 Internet speed test. No Flash or Java needed! It is the smartest and most accurate online bandwidth test. It works well on iPhone, iPad, Android, Windows 8 and other mobile devices, as well as desktop computers.
More than a simple speed test, nPerf brings you the best and the fullest mobile connection quality measurement tool up to 10 Gb/s speeds! Full QoS test: In few seconds, test your bitrate speed, latency, browsing speed and video streaming quality on your mobile device.
Testmy.net is an internet connection benchmark tool, offering both Download and Upload connection speed tests. With SmarTest Testmy.net will automatically adjust for your line speed and use the most optimal test size for your connection type.
speed.cloudflare.com is a tool that allows you to measure the speed and consistency of your connection to the Internet. You can use it to verify that the speed your ISP promised you is the speed you are getting.