Rsearching Options for Personal Finance Software for My iPhone

I have been trying to get a better handle on my money. There was a time when I used to spend as much as I wanted on whatever I wanted. Now, I am older and a little bit wiser and I am trying to save more and spend less. So, I have been researching my options for personal finance software. I would like something that I could use on my iPhone. I think it would be great for me, if I could keep track of my expenses and how much I am spending when I am out and about spending it!