I'm not sure if by "app" you meant app specifically for a smartphone, or if you meant for a PC - but I believe RescueTime might do what you're looking for (and

I'm not sure if by "app" you meant app specifically for a smartphone, or if you meant for a PC - but I believe RescueTime might do what you're looking for (and they're a YC company I believe): http://www.rescuetime.com/ http://www.rescuetime.com/