Neither OptinBox nor Acalytica Social Proof offers a free trial.
OptinBox is designed for Large Enterprises, Medium Business and Small Business.
Acalytica Social Proof is designed for Large Enterprises, Medium Business and Small Business.
Pricing for OptinBox Starts at $4.99/Month whereas for Acalytica Social Proof Starts at $10.83/Month when Billed Yearly.
Some top alternatives to OptinBox includes Social Proof Signals, Notipack, Social Proofy, Popify, Qualified, eNotify, Notificationpro, SocialProof, Acalytica Social Proof, Workvivo, IFTTT and Pushfy.
Some top alternatives to Acalytica Social Proof includes Fomo, Social Proof Signals, SuperProof, ThunderGrowth, ProofSky, Evidence, Social Proofy, eNotify, Proofly and SocialProof.