Windows, Web & Android need to be included with the purchases of Mac and IOS versions. Currently Goodnotes 6 has a one time purchase and yearly subscription for the Apple versions but only has yearly options for Windows, Web & Android. As someone who has a windows computer but also an ipad i have to pay 10$ a year to have my account work on both windows and ios. By the time I finish college my total in yearly subs will come out to almost three ios one time purchases. The one time purchase needs to include all platforms and not just apple for those who use multiple device types.