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In addition to the website and the smartphone apps, Ookla also has apps that you can run on Windows or on Mac. Most recently, the service released a video-specific speed test that measures your network's ability to handle 4K video streams. Ookla's done a good job of keeping up with the times by adding new features and capabilities over the years.
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Incidentally, Ookla's speed test is also the one we use when we're testing Wi-Fi routers. Popularity aside, we like Ookla for having everything a basic user needs from a speed test: accuracy, the ability to view your speed test history (when you create an account), a wide array of servers to connect to, and even a handy app for speed testing from your Android or iOS device. One of our favorites is the Ookla speed test, which has a strong reputation for consistency and for being one of the first speed tests on the web.