Yes, both Sellerboard and AMZRank offer a Free Trial.
Sellerboard is designed for Large Enterprises, Medium Business and Small Business.
AMZRank is designed for Freelancers, Medium Business and Small Business.
Pricing for Sellerboard Starts at $15/Month when Billed Yearly whereas for AMZRank Starts at $452/Month.
Some top alternatives to Sellerboard includes Jungle Scout, ProfitBoard, SellerCenter, Marketplace Manager, SellerApp, AMZInsight, Helium 10, ProfitGuru, azManifest.com and Semrush E-Commerce Apps (Sellzone).
Some top alternatives to AMZRank includes SE Ranking, Rankz, AMZ.One, AMZScout, AmzChart, Sellerboard, AMZInsight, ProfitGuru, Qualified, Workvivo, IFTTT and Semrush E-Commerce Apps (Sellzone).