blip: a tool for seeing your Internet latency
Why is your Internet slow? It's probably not bandwidth. Here's a graph of your internet performance, right now:
(If you're reading this through RSS and your reader doesn't support iframes, you can visit the app at gfblip.appspot.com. Also try it on your phone or tablet.)
This real-time latency based measurement is way more accurate than speedtest.net at predicting your real web browsing performance. Although maybe a bit harder to interpret the results.
For more information, motivation, philosophy, and ranting, read the README.
And it's open source. Have a nice day.