InboxPro offers Free Trial, but Sigmail does not.
InboxPro is designed for Large Enterprises, Medium Business and Small Business.
Sigmail is designed for Large Enterprises, Medium Business and Small Business.
Pricing for InboxPro Starts at $7.49/User/Month when Billed Yearly whereas for Sigmail Starts at $29/Month.
Some top alternatives to InboxPro includes GMass, AutoPitch, SmartWriter, Mixmax, Ghostwrite, Qualified, SmartReach.io, Workvivo, Sigmail, IFTTT and Consider.
Some top alternatives to Sigmail includes SmartWriter, Seamless.AI, SalesIntelligent, Saleswhale, SalesRobot, Qualified, Magic Sales Bot, Workvivo, SellScale, Lyne.ai and IFTTT.