Idk which is why I'm asking

Chat overlay for which platform lol?

Also, wouldn't it be best to use a search engine

OBS lol

That's a recording software.

I meant Twitch, YouTube, etc lol

And there's probably extensions or plugins that do that somewhere

Oh, both at the same time. Like GrandPooBear, Pointcrow or Cjya

are you talking about the chats that show up in the stream itself?

Ig you could say that

In terms of OBS widgets, looking at different chatbots and their stuff would be the way to go, like using Streamlabs or Streamelements. Really "best" for these types of things is purely subjective. I've personally used the Streamlabs widgets years before they ripped off OBS with their Streamlabs OBS project, but I know a lot of people that like Streamelements more.