Yes, both Kiwi for Gmail and Consider offer a Free Trial.
Kiwi for Gmail is designed for Large Enterprises, Medium Business and Small Business.
Consider is designed for Freelancers, Medium Business and Small Business.
Pricing for Kiwi for Gmail Starts at $29.99/Year whereas for Consider Starts at $10/User/Month.
Some top alternatives to Kiwi for Gmail includes Google Workspace, Google Admin Console, Qualified, Workvivo, KnowledgeOS, Shift, Desktop.com, WorkDesk, IFTTT, Drag and Consider.
Some top alternatives to Consider includes Salesforce Email Studio, Gist, automation.re, Qualified, Workvivo, InboxPro, Flowall, Pascal Workflow, Sociocs, Drag, Quickflow and Loop Email.