(A free iOS version has been available for years.) The free Mac app also includes 7GB of free storage space on Microsoft’s servers. One thing that does make OneNote for the Mac particularly notable (pun intended) is that it’s free. The company is positioning OneNote as a competitor to Evernote, and as such the app does offer some compelling features. Microsoft has just released a version of OneNote-its note-taking app for capturing, storing, and organizing all kinds of information- for the Mac.