I use Worksnaps. It has a very accurate and verifiable time tracking, hourly based invoicing and payments are not guess work anymore. It is also integrated with

I use Worksnaps. It has a very accurate and verifiable time tracking, hourly based invoicing and payments are not guess work anymore. It is also integrated with leading project management and invoicing services such as Basecamp, Freshbooks, Harvest etc. Very effective and easy to use.