For basic use, the platform is free and requires no registration, and all data is stored locally in the browser. Data synchronization and collaboration with other users are available by subscription.
There are a lot of things in the plans, for example, the task tracker and calendar mentioned earlier, sharing of boards, pages and other objects.
I will be glad to hear your feedback.
PS: For some reason, Monaco Editor (the library that displays the code on canvas) is not friendly with the library that I use to work with canvas in Safari and on mobile devices, so the elements may be blurred. I'm working on fixing this issue.