yes I purchased for both my iPhone and my MacBook Air. But the one on my MacBook Air does not work and seems to think I need to purchase it. Honest to god I'm sick of it and probably going back to paper dive logs. I'm fine once I get into something but I hate stuff like this.I don't understand. Aren't they two different pieces of software? On the MacDive website it says that you can purchase a single license for $25 or $40 for up to 5 installations. But I don't think that they sell the iPhone app through that site. Didn't you buy that separately through the app store?