Yes, both Userback and Rollbar offer a Free Trial.
Userback is designed for Individuals, Freelancers, Medium Business and Small Business.
Rollbar is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Userback begins at $14/Month when Billed Yearly, while pricing details for Rollbar are unavailable.
Some top alternatives to Userback includes Backlogs, Backlog, ReportBugz, Buglog, Usersnap, Ybug, Bug-Track.com, Disbug, Feedback Monkey and Toybox.
Some top alternatives to Rollbar includes Jira, Sentry, Bugsnag, Zoho BugTracker, ReportBugz, BugHost, Bug-Track.com, Disbug and Crash Catch.