airfocus, UserVoice, Mopinion and Contentsquare all promise to turn user gripes into product decisions. In the space of a year most of them stopped being independent companies - and that tells you where the whole category is heading.
Medallia, Marker.io, Userback and airfocus all promise to capture what users think - but they disagree completely on what feedback is even for. Here is how the modern feedback stack really splits.