Yes, both Flow and Quickbase offer a Free Trial.
Flow is designed for Large Enterprises, Medium Business and Small Business.
Quickbase is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Flow Starts at $6/User/Month when Billed Yearly whereas for Quickbase Starts at $35/user/month when yearly.
Some top alternatives to Flow includes Quickbase , Smartsheet, ClickUp, Zoho Projects, Wrike, TeamGantt, Teamwork, ProjectManager.com, Microsoft Project, ProWorkflow, Trackboard, TaskBranch, Quick Base, Height, Task Flow and Project Insight.
Some top alternatives to Quickbase includes Smartsheet, ClickUp and Zoho Projects.