A:AnswerThe Razer software probably won't work, although there are always work arounds, but the kiyo should still work as a standard usb webcam with no software.
A:AnswerYes, it has a microphone, but read the details of the product listing to make sure. (I bought mine in early Feb 2021.) I remember seeing old reviews and product listings saying it did not have a mic, so I'm guessing that was for older versions of the Kiyo.
A:AnswerNo. As it mainly needs Synapse 3, it's not Mac-compatible and there's no official support yet for Mac. Razer Kiyo's system requirement should be Windows® 7 64-bit (or higher). Furthermore, it might still work as a standard USB-webcam without the software for other basic features to work like for video chats with friends and or for business calls.