Commucar is an application for motorists that notifies and warns your phone of any visible problem that your car has or may have, detected by other users, without your phone being visible. It works by contacting your license plate, from the license plate of another user's car. Some of these inconveniences can be lights on, forgetting keys in the trunk, window open, parking incorrectly, computer visible on the seat, a photo of a car that hit you, a stranger looking through the window of your car, and dozens of other cases. At Commucar all users are eventual observers of these inconveniences. And everyone can support you, letting you know. It allows you to send written messages, recorded messages and photos.