Yes, both InboxPro and Mixmax offer a Free Trial.
InboxPro is designed for Large Enterprises, Medium Business and Small Business.
Mixmax is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for InboxPro Starts at $7.49/User/Month when Billed Yearly whereas for Mixmax Starts at $9/User/Month when Billed Yearly.
Some top alternatives to InboxPro includes ReclaimAI, ZoomInfo InboxAI, GMass, AutoPitch, SmartWriter, Mixmax, Ghostwrite, Qualified, SmartReach.io, Workvivo, Sigmail, IFTTT and Consider.
Some top alternatives to Mixmax includes Apollo.io, AroundDeal, CrankWheel, ZoomInfo Engage, EngageBay, Hubspot Marketing Hub, HubSpot CRM, EngageBay Sales CRM, Highspot, Outreach, ImagineSales, Adapt Engage, OutReachly by 500apps and SalesHandy.