It depends on what you define as startup and what you define as profitable. Visual Website Optimizer beta was launched in December 2009, I quit my full time job

It depends on what you define as startup and what you define as profitable. Visual Website Optimizer beta was launched in December 2009, I quit my full time job in March 2010 (yay, it will be one full year soon!) and then launched paid plans in May 2010. Within first week, sales of VWO >> my previous salary. And that's how I define the startup as profitable.