A list of services to check how fast your internet connection is. You can easily measure it in browsers like Google Chrome, Safari, or Edge. It also works fine from your iPhone or Android smartphone.
fast.com

https://fast.com/ja/ A simple internet speed measurement service provided by NETFLIX. So far, this is the one that gives me the fastest numbers. By the way, the line I used for testing is the EO Hikari Home Type 1-Gig course. (Measured with Microsoft Edge.)
Ookla Speedtest

https://www.speedtest.net/ The browser version of the famous Ookla Speedtest. Smartphone apps are also available — you can download the iOS version here, and the Android version here.
speedcheck.org

https://www.speedcheck.org/ja/ With a clean, simple screen, you can run a measurement easily with just one button.
minsoku.net

https://minsoku.net/ You can measure your own internet speed while comparing it with other people's connections. Measurement results for budget SIMs (MVNOs) are also provided.
Google.co.jp

https://www.google.com/search?q=internet+speed+test&oq=internet+speed+test Google's official speed check service. You can start the test right from the search screen.
netspeed5beta.studio-radish.com

http://netspeed5beta.studio-radish.com/ You can configure things like the compression ratio, which lets you run a more detailed test. A Java applet may be required for measurement.
Nothing beats a fixed-line connection?!

Speed test results on a 4G LTE connection (budget SIM)
These days, more and more people are choosing not to install a wired internet connection at home, but if you want to comfortably watch YouTube, hulu, or NETFLIX, a fast fixed-line connection is still the way to go. Also, smartphone mobile data has a monthly cap on how much you can use, but with a fixed line there's basically no cap, so you can use it without worrying about your data allowance.
