iOS: There really isn't anything that's exciting about tracking your finances, but if you're looking for something with a great design and interface, Spendbook does the job.
Spendbook is a manual personal finance tracking tool that gives you all kinds of great graphs to work with. As with any of these types of tools, you'll need to enter your expenses manually, but Spendbook is really pleasant to use.
With just a couple of taps, you can enter in all your expenses for the day, set recurring expenses, and look at all kinds of graphs detailing where you're spending money. You can set subcategories to keep close track of spending, add photos to transactions, view all you upcoming expenses in a month calendar, and add notes wherever you need to. It's one of the better looking finance trackers out there, and it's fun enough to use that you might even enjoy reconciling your bank account.
Spendbook ($2.49) [iTunes App Store]