We currently do not have any free version of GrassBlade xAPI Companion plugin.
A demo site with full features in paid version is available at: https://demo.nextsoftwaresolutions.com/wp-admin
Username: demo
Password: demo
Watch our video tutorial (for paid version): How to upload Tin Can content on WordPress?
Note: Any information you put up on demo site can be visible to others and the data can be reset at anytime.