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, FigJam, UX-App, UXCam, UserX, User Insights, UserZoom, Optimal Workshop, UX Metrics, UserBit, Proven by Users and Lean UX Canvas.