You can have mac wallet, I think the masternode might be for just win/linux. I'm not sure though, I never set up a masternode and today the coin jumped to like 5 times what I paid for it, so I sold 500 coins so that I got back my initial investment (and more) so now I'm left with 500 XIOS, at least until another dip when I can buy back in . Edit- Just bought back in, now I have 1000 free coins, time to have another go at a masternode ;)