I purchased this app with the hope that I wouldnt have to constantly login to my 2012 MacBook air running Yosemite. It destroyed the operating system so bad that I had to reinstall and it never worked. I emailed the support address I never got a response. Upon my second email, I got a mass email response but said they pulled the app from the app store. Do not buy this product! They are not even responding to support requests.