Kakebo is a Japonese personal finance book. It got trendy about a year ago, and it was featured in several television shows. It's divided in weeks, months, and it also divides your spendings in categories. There's other stuff that I don't know about probably... Seems useful, but I'm not sure if there's something there that that a mobile App won't do. Is anyone using it, and if so, can't you please share your thoughts on it?