Yes, both FunctionFox and Intervals offer a Free Trial.
FunctionFox is designed for Individuals, Freelancers, Medium Business and Small Business.
Intervals is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for FunctionFox Starts at $5/User/Month whereas for Intervals Starts at $29/Month.
Some top alternatives to FunctionFox includes Quickbase , Smartsheet, ClickUp, Zoho Projects, TimeTracker App, TrackingTime, Tick, TimeTrack, Trello, Wrike, Track My Work, Teamwork, ProjectManager.com, Trackboard, Quick Base and TaskBlast.
Some top alternatives to Intervals includes Quickbase , Smartsheet, ClickUp, Zoho Projects, TimeTracker App, Tick, TimeTrack, Time Track Bill, TimeControl, Wrike, Track My Work, Teamwork, ProjectManager.com, ProWorkflow, Quick Base and TaskBlast.