Yes, both SellerApp and AMZRank offer a Free Trial.
SellerApp is designed for Large Enterprises, Medium Business and Small Business.
AMZRank is designed for Freelancers, Medium Business and Small Business.
Pricing for SellerApp Starts at $39/Month when Billed Yearly whereas for AMZRank Starts at $452/Month.
Some top alternatives to SellerApp includes Jungle Scout, CommerceIQ, Marketplace Manager, AMZScout, FOSHO AFF, AMZInsight, Helium 10, Omnyfy, Optiseller and OneMarket Insights.
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).