Neither Backlogs nor Primary offers a free trial.
Backlogs is designed for Medium Business and Small Business.
Primary is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Backlogs Starts at $29/Month when Billed Yearly whereas for Primary Starts at $8/Month when Billed Yearly.
Some top alternatives to Backlogs includes Aha!, ProductPlan, productboard, Productroad, FeedPiper, ProductFlare, Next Please, Primary, IdeaPlan and LaunchNotes.
Some top alternatives to Primary includes Figma, UX-App, UXCam, UserX, User Insights, UserZoom, Optimal Workshop, UX Metrics, UserBit, Proven by Users and Lean UX Canvas.