Loan-U-Later is a simple loan/investment calculator that can calculate nearly any aspect of a loan/investment, including the interest rate.
Coming soon: amortization tables!
So don’t waste any time, go and get it at the iTunes App Store
The app’s website can be found here.
Nice app – works like the mac version which is what I wanted. It would be better though is the changing background color could be turned off. It is hard to use in a serious setting with that going on in the background.