Commenty, BugHerd, zipBoard, not8, Usersnap, Timeline.io, Gleap, Nolt, Heartcount, Survicate, Marker.io, Frontosaur, TrackDuck, BugReplay, Ybug, Pangolin, Loop Feedback, qTrace, Buglog, Bugyard, Flowcast, Cereo, InSite Feedback, Zinputs, DebugMe are some alternatives to Userback.