Prospect.io offers Free Trial, but Zapier does not.
Zapier is designed for Large Enterprises, Medium Business and Small Business.
Prospect.io is designed for Freelancers, Medium Business and Small Business.
Pricing for Zapier Starts at $19.99/Month when Billed Yearly whereas for Prospect.io Starts at $19/User/Month.
Some top alternatives to Zapier includes Pabbly Connect, Integrately, eZintegrations, Zoho Flow, ZapUp by 500apps, SaaS Integrator, Built.io Flow, Activepieces and ApiX-Drive.
Some top alternatives to Prospect.io includes Apollo.io, AroundDeal, CrankWheel, ZoomInfo Engage, Reply, Outreach, ImagineSales, Adapt Engage, Sales Booster by Leadspicker, OutReachly by 500apps, Respond.io, Closely and SalesHandy.