Inbox is like in Gmail. It's a list of posts. There are tags for posts.
Post is like in Reddit, (except you can mark comments as read to grey out their backgrounds, & there's a left sidebar that has links to all the unread comments in a post). It's a hierarchy of comments organized by time, oldest at the top, newest at the bottom. You invite people into posts. Posts are not public.
Contacts & Blocks is like in Gmail.
Comments Made & Comments Saved & Comments Replies is like in Reddit.
I think this app could supplement email. It supercharges conversation quality for long, private, complicated discussions. I would like to make it but I don't want to deal with moderation & managing people.