Yes, it’s free and best for team up to 8 people with a limited number of workspaces and projects you can create.
Due to the nature of complexity, currently we’re focusing on website which can be accessed from desktop, tablet and laptop. Some advanced components such as the Kanban Board with stages may not look great on mobile phone. We will be working on mobile app version of Qanban when there’s need for it.
We designed Qanban to be as simple and as intuitive as possible. You could refer to our documentation page in here. Alternatively, if you have any question, do it via contact us or via email and we’ll get back to you as soon as we can.