Hello! We're busy making major improvements to Chartnado. The next release is not going to be backward compatible with the current release, so we are not currently charging for Chartnado. When it's released, it will be around $5/User/Month (USD).
We appreciate the support we're getting from our beta testers! We're happy to announce that in addition to building and presenting your dashboards in Excel, we'll be supporting publishing your dashboards to both Office 365 and on-premise hosted Sharepoint 2016 with this release. Stay tuned!