I'm not sure about methodology differences, but this service tells a different story: https://truemarketshare.com/operating-system-market-share?options=%7B%22f

I'm not sure about methodology differences, but this service tells a different story: https://truemarketshare.com/operating-system-market-share?options=%7B%22filter%22%3A%7B%22%24and%22%3A%5B%7B%22deviceType%22%3A%7B%22%24in%22%3A%5B%22Desktop%2Flaptop%22%5D%7D%7D%5D%7D%2C%22dateLabel%22%3A%22Trend%22%2C%22attributes%22%3A%22share%22%2C%22group%22%3A%22platform%22%2C%22sort%22%3A%7B%22share%22%3A-1%7D%2C%22id%22%3A%22platformsDesktop%22%2C%22dateInterval%22%3A%22Monthly%22%2C%22dateStart%22%3A%222016-03%22%2C%22dateEnd%22%3A%222017-02%22%2C%22segments%22%3A%22-1000%22%7D https://truemarketshare.com/operating-system-market-share?op... Clear the 'Desktop/Laptop' filter and it gives share on all platform types. I think the difference in numbers may be due to this service is measuring only browsing activity. It also removes 21% of traffic detected as bots, so that may also have an effect.