One such application I have been using for years.....started with the palm pilot 20 years ago was a form of digital checkbook recording system...
With the advent of the IPod, I started using a more advanced app called... "Accounts"
That app along with my bank app are the two I use the most....makes it a lot easier to stay on budget
I rarely carry any cash unless I'm on the road...
Around town, It's only coffee money I carry...
What is your favorite app!