Red bean app is downloaded in the mobile phone. According to relevant public information, Red Bean app has two versions: Android2.3+ and iOS5. 1+, which can be downloaded directly in the mobile phone application market. "Red Bean-Business Card Socialization" is a free electronic business card exchange and address book management software, which provides various electronic business card exchange functions such as posting on mobile phone, instant group exchange, QR code scanning, etc., so as to adapt to business card exchange in different social occasions and network environments.