Harpoon offers Free Trial, but Billable does not.
Harpoon is designed for Medium Business and Small Business.
Billable is designed for Individuals, Freelancers and Small Business.
The starting price of Billable begins at $8.40/Month, while pricing details for Harpoon are unavailable.
Some top alternatives to Harpoon includes Freshbooks, ProfitBoard, Clear Books, TimePay, AlignBooks, FuelGauge, AccooWare, Reach Accountant, Billable and Busy Accounting Software.
Some top alternatives to Billable includes TimeTracker App, Tick, TimeTrack, TimeQ, Timebase, Time Track Bill, Timesheet, Time Analytics, AtTrack and Timet.