Arkio is free to use for personal projects. To extend Arkio with professional features like unlimited meetings and imports/export of larger models from Revit, Rhino Sketchup and BIM 360 a Pro or Enterprise license is needed.
You can try Arkio's professional features in a free 14-day trial. Paid licenses are floating so they can be shared with multiple people in your organization. More information can be found on our pricing page.