Nostrchat.io has this. It's pretty good IMO.
Discussion
nice one.
https://www.nostrchat.io/channel/013a92ac6698bc0fd5497836f4fd1c29b48f88375ca03440e31f1feca79f58b5
Working as expected 
It’s a bit of a ghost town, General security question - couldn’t any site asking for your nsec just steal it? Can’t just go sticking your nsec in every site or app