If counted, it doesn't appear in the device page list. This has changed. I remember to have my mobile, my personal laptop (with windows app) and connecting via web browser in my business laptop. All of them worked with the free user account. Maybe it was a bug just for me, but I worked.
BTW... If you have in your windows laptop a heavy client (Windows App) and the Web browser, how many devices are counted? Or even worse, if you use Chrome and Firefox in the same device, both are counted as well? I don't think so, but I could be wrong as I'm not an expert on this topic.