Yes, both Sellerboard and Jungle Scout offer a Free Trial.
Sellerboard is designed for Large Enterprises, Medium Business and Small Business.
Jungle Scout is designed for Medium Business and Small Business.
Pricing for Sellerboard Starts at $15/Month when Billed Yearly whereas for Jungle Scout Starts at $19/Month when Billed Yearly.
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 Jungle Scout includes Sellics, AMZ.One, Marketplace Manager, AMZScout, AMZ Alert, AMZInsight, Helium 10, Optiseller, ProfitGuru and AMZRank.