Yes, both Intervals and Freshbooks offer a Free Trial.
Intervals is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Freshbooks is designed for Freelancers, Medium Business and Small Business.
Pricing for Intervals Starts at $29/Month whereas for Freshbooks Starts at $8/month when monthly.
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.
Some top alternatives to Freshbooks includes Quickbooks, Xero, Zoho Books, FreeAgent, QuickFile, HoneyBook, Zoho Invoice, Busy Accounting Software, QuickBooks Desktop Pro and Wave.