Yes, both Proof and ProofSky offer a Free Trial.
Proof is designed for Medium Business and Small Business.
ProofSky is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for Proof Starts at $26/Month when Billed Yearly whereas for ProofSky Starts at $7.50/Month when Billed Yearly.
Some top alternatives to Proof includes and undefined.
Some top alternatives to ProofSky includes Fomo, Proof, Konverto, Social Oracle, Super Social Proof, Sooproof, Social Proofy, Proofly, SocialProof and Acalytica Social Proof.