Amplenote and Roam are more different than they are similar, but there are still many common touchpoints. Below, we'll outline how the two compare as of mid-2020. If you would like to import your Roam JSON file to see how it compares in Amplenote, you can start a free trial and then try out our Roam Research Importer here. Paid annually, Amplenote pricing ranges from about $5/month to $25/month.
Looks like yet another silo version of a note taking application. I think I’d prefer something more IndieWeb.