Yes, both ProveSource and Nextsale offer a Free Trial.
ProveSource is designed for Large Enterprises, Medium Business and Small Business.
Nextsale is designed for Large Enterprises, Medium Business and Small Business.
Pricing for ProveSource Starts at $18/Month when Billed Yearly whereas for Nextsale Starts at $39/Month.
Some top alternatives to ProveSource includes Fomo, Proof, JustProof, Conversion Plus, Super Social Proof, Sooproof, Social Proofy, Trustpulse, Proofly and Prooven.io.
Some top alternatives to Nextsale includes Fomo, Proof, JustProof, Social Oracle, Super Social Proof, Sooproof, Notipack, Social Proofy, Proof Pulse and Proofly.