RollingCoin Wallet for Android
The receipt is in the app before you reach the car
Cash slips through every budget, because nobody writes it down. The RollingCoin Wallet companion app for Android fixes that: pay, open the app, take a picture. The amount is read from the receipt, the shop is remembered by its place, and the payment waits on the phone until it can reach RollingCoin on your computer.
The phone and the computer talk over your own network: the phone hands its payments over whenever it is on your home Wi-Fi, the same network as the computer. There is no server in between and no account to create: the phone is paired with the computer once, by scanning a code.