Mac: There are plenty of browser tools out there for testing your internet speed, but they’re usually filled with obnoxious ads. If you’d prefer a native app, Speedster is free and does its job well.
With the free version of Speedster you get three tests a day. If you need more than that, there’s an in-app purchase for $3.99 that’ll get you unlimited tests. Just launch the app, click the test button, and it’ll do the rest. It’s a little thing, but it’s still pretty great to keep around for when you’re worried about issues with your Internet speed.
Speedster (Free) | Mac App Store
via Lifehacker
Speedster Is a Native App for Testing Internet Speeds on Mac