I've used it on a mac (original macbook). The first time, everything worked as planned. The second time, I knew the measurements were way off, but I could never figure out why; Probaby user error. There's a guide for all the settings on some forum; I can't remember where I found it. Just do a google search for "Room EQ Wizard" and "Mac" or "Macbook" and it should turn up. Mind you, they recently came out with a later version of REW, version 5. I used the older version, so I can't speak for the newest build.