There have definitely been a few over the years, especially if you include scenarios beyond just "get notified for replies". Some have been webapps, some have b

There have definitely been a few over the years, especially if you include scenarios beyond just "get notified for replies". Some have been webapps, some have been browser plugins, etc. Here's some discussion of one recent one: https://news.ycombinator.com/item?id=21172406 https://news.ycombinator.com/item?id=21172406 And some more: https://news.ycombinator.com/item?id=42814917 https://news.ycombinator.com/item?id=42814917 And HNChat, which went a little further: https://news.ycombinator.com/item?id=12431724 https://news.ycombinator.com/item?id=12431724 That said, don't take this as criticism. It's clearly something that some HN users want. If you can make it stick, more power to you!