Yes, it is compatible. It works with the browser, but the other apps have to add compatibility. Why doesn't it just work? Because the app makers didn't test for this compatibility when they made their apps, so it might break their application if it was just enabled.
Also, previous year's models of keyboards aren't compatible.
I was wondering if Samsung's smart wireless keyboard (http://www.samsung.com/us/video/tvs-accessories/VG-KBD1500/ZA)
is compatible with my UN46ES7100F smart TV.
Also, i have seen Amazon reviews of the keyboard, stating it can only work in the web browser and not in the Apps (e.g. Netflix or Youtube).
Since it is a big deal for me, I was wondering which services in my smart TV are compatible with the keyboard? Is it only usable in the Web browser or on other apps as well? If not, is there any other way that I can have a qwerty keyboard inside my Netflix or Youtube app? e.g. can I buy the qwerty remote of 2011 models? are they compatible?