If you're looking for an easy way to keep track of your spending than you need to get the iSpending app. And it's my favorite price $0!
It's easy peasy super easy. Simply put in your income and then with one push you can put in each expense that you have throughout the day. On a weekly, monthly or yearly basis you can see if you're staying on track for your savings goal.
Want to retire in 20 years? Go to the retirement chart and see what percent you need to save. Then follow that percentage each week to maintain your goal.