Yes, both SellerApp and Jungle Scout offer a Free Trial.
SellerApp is designed for Large Enterprises, Medium Business and Small Business.
Jungle Scout is designed for Medium Business and Small Business.
Pricing for SellerApp Starts at $39/Month when Billed Yearly whereas for Jungle Scout Starts at $19/Month when Billed Yearly.
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 Jungle Scout includes Sellics, AMZ.One, Marketplace Manager, AMZScout, AMZ Alert, AMZInsight, Helium 10, Optiseller, ProfitGuru and AMZRank.