Yes, both InboxPro and Sidekick offer a Free Trial.
InboxPro is designed for Large Enterprises, Medium Business and Small Business.
Sidekick is designed for Large Enterprises, Small Business and Medium Business.
The starting price of InboxPro begins at $7.49/User/Month when Billed Yearly, while pricing details for Sidekick are unavailable.
Some top alternatives to InboxPro includes Apollo.io, AroundDeal, CrankWheel, ZoomInfo Engage, GMass, AutoPitch, SmartWriter, Mixmax, Ghostwrite, Qualified, SmartReach.io, Workvivo, Sigmail, IFTTT and Consider.
Some top alternatives to Sidekick includes Apollo.io, AroundDeal, CrankWheel, ZoomInfo Engage, SmartSupport, ClientSuccess, Custify, Chameleon, HelpHero, Freshdesk Customer Success (Formely Freshsuccess), Experience Layer, Driftly, Supademo and PointHelp.