What are some alternatives?
When comparing Invoice Ninja and TimeCamp, you can also consider the following products
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
FreshBooks - The ideal accounting software for small business owners.
InvoicePlane - Free and open source invoicing application to host on your own server.
Time Doctor - Time Tracking and Time Management Software that is accurate and helps you to get a lot more done each day.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.