I am new and one of the reasons I joined was to find out what would be the best and easiest way to track? Previously, I was using myfitnesspal, which is real easy and fast. It does not have the best breakdown of nutrients, unless you go online to your computer. I'm not sure how specific I need to get. I looked at the following: cronometer but having difficulty with Ipad. It tends to freeze up alot and therefore makes tracking slow.
I also looked at nutritiondata, it looked like it would take some time to figure out.
Nutridiary looked similar to cronometer.
I don't think there are any apps other than myfitnesspal.