On Divio Cloud you can choose between various plans for your Live Server subscription. The Test Server is aways free.
You can select the appropriate plan for you in the Live Settings section of your project in the Divio Control Panel.
Compare plans to select the appropriate one for your project. Remember that you can choose a different plan for each of your projects.
An Organisation plan allows you to work together on projects with other collaborators.
To add collaborators to an organisation, you need to upgrade to a paid Organisation plan in the Collaborators section of the Control Panel, where you can set the number of collaborators.