Embeddable viewer comments/chat box and/or question voting system

Looking for something that isn’t as hideously expensive as Slido just to do the chat box, question voting up and down thing for remote users. Can be web interface or app or both (preferably).

Main reason I don’t want to use free version of Slido and alternatives is because I need moderation (will have politicians as guest and they’re often the target of inappropriate comments) and I need ~200 potential participants. For Slido that means I need the most expensive version, even though I will use only 1% of its functionality. Not fair.