BootSignal

Comments, upvotes, reactions, ratings and polls drop into a site through one script tag. Auth, storage and translations already live inside the widget, so there is no backend to write.

BootSignal keeps more than interaction widgets in the same place: free utilities such as QR codes and D-day counters, display pieces like countdowns and announcement banners, and a library of snippets to paste. There is a single plan, all access at twenty dollars a month, and one subscription covers one domain. Inside that domain the price does not move with how many widgets you switch on.