Hey, for a fair comparison with pinboard you should check out our personal pricing plans, https://www.tefter.io/personal which start from $9/year. The 39$/month you mentioned is for team workspaces of unlimited members.
Shameless plug: I run https://tefter.io a pinboard alternative which supports importing your bookmarks from pinboard and even has team collaboration features.
Another thing worth trying, is connecting a Livebook instance (see: https://livebook.dev/) to a running application.
Keep in mind Livebook allows for multiple users to work on the same notebook at once so this can come handy in pair-programming / debugging situations.