FreshBooks
Freshbooks offers Free Trial, but I'm Productive does not.
I'm Productive is designed for Large Enterprises, Medium Business and Small Business.
Freshbooks is designed for Freelancers, Medium Business and Small Business.
Pricing for I'm Productive Starts at $50/Month whereas for Freshbooks Starts at $8/month when monthly.
Some top alternatives to I'm Productive includes Quickbase , Smartsheet, ClickUp, Freshbooks, Next Please, Wrike, Zoho Projects, monday.com, Teamwork, ProWorkflow, Workep, Worksuite, Watchwork, WirTask, Trackboard, Quick Base, Today, Flowist and Resource Guru.
Some top alternatives to Freshbooks includes Xero, Sage Accounting (Sage One), Patriot Accounting, Quickbooks, Zoho Books, FreeAgent, QuickFile, HoneyBook, Zoho Invoice, Busy Accounting Software, QuickBooks Desktop Pro and Wave.