Autodesk Sketchbook has been available on the Mac App Store for years - if we remember correctly from 2014. Since then it has compiled quite a few downloads and has positioned itself as one of the alternatives for all those who like to draw digitally and do so from a Mac —or other platforms—. However, if you have been following his path, there has always been a paid version, which can be monthly or yearly. This has changed and from the company they have decided that Autodesk Sketchbook should be free for everyone. And including, of course, all the tools; that is, the full version.
From now on, if you want to use Autodesk Sketchbook on your Mac, you'll have it easy: all tools will be available, free of charge and forever. As simple as that. Be careful, because this free mode does not have purchases within the application. Also, the Enterprise version - business - will have an annual cost of $ 85 (69 euros).
Leaving this topic aside, what you will continue to need, according to reporting from the forum itself —and official announcement— is an Autodesk ID; that is, be registered to be able to use it. If you are reluctant to give your data, you always have the possibility to download the app for free and use it without registration for 7 days, although after this time, yes or yes, you will have to register to continue using Autodesk Sketchbook.
On the other hand, remember that Sketchbook also works under iOS and if you have an iPad compatible with Apple Pencil it can be a good platform to give free rein to your imagination. What's more, if you are one of those who have an account open in iCloud with enough space, Sketchbook is compatible with Apple's cloud service and you can synchronize your work between devices and continue with your work wherever you are.