Adobe
Yes, both TestRail and Backlog offer a Free Trial.
TestRail is designed for Large Enterprises, Medium Business and Small Business.
Backlog is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
The starting price of Backlog begins at $29.16/Month when Billed Yearly, while pricing details for TestRail are unavailable.
Some top alternatives to TestRail includes Jira, ReQtest, Zoho BugTracker, Bug-Track.com, TestCaseLab, Qase, Kualitee, QuAck, Crash Catch and QA touch.
Some top alternatives to Backlog includes Quickbase , Smartsheet, ClickUp, Jira, Wrike, TeamGantt, FogBugz, Teamwork, ProjectManager.com, Trackboard, TaskBranch, Quick Base, TestRail, Height and Project Insight.