Hey! I'm not counting, but back when I was I used My Fitness Pal, it's pretty groovy. It has the nutritional info for a lot of foods already included so you don't need to add everything manually, plus it's helpful if you want to compare the nutritional info on different foods without actually having to go out and buy them first. You can even add custom foods to your list with different ingredients in case you use them again
Right now I'm just using MY Weight, just for tracking, well... weight. I like to look at the graph when I'm having a slow time of it. It shows your average loss per week and is really handy for spotting trends. Also gives you a projected goal date based on your info so far.
Not sure if this is helpful, but I also use Moody Me to track my moods... the graph comes out looking bipolar
If I have an exceptionally unusual week regarding my weight loss, I compare it with that app and can learn which food cravings, exercise behaviours crop up with different moods. Always a handy part of my toolkit.
Oh, and this isn't an app, but anyway... I have a bookmarks folder on my phone where I add any web pages that I find particularly useful, motivational, full of good info, talking about the mental part of weight loss, many threads on this forum. That's been invaluable as if I'm having a go slow or need a recipe, I don't need to hunt all over the Internet for the info I need
All iPhone by the way, but I think these apps might be on other platforms as well