You can take a Premium subscription to enjoy organisation features: unlimited number of attachments, meeting creation, presentation mode, dashboard, synchronization with your calendar...
Some features of the application are not available, for instance, the Gantt chart or the team schedule.
The Premium subscription is personal and can be taken via the web application or the mobile application.
You can choose to take a monthly or yearly subscription. The yearly subscription entitles you to a discount.
To read about the terms and prices of the different subscriptions, see this page.
To display/change your current subscription, see this page.