IOB UPI Vyapar is a free productivity application designed for Android users, focusing on financial transactions. The app facilitates seamless payments using the Unified Payments Interface (UPI) system, requiring users to register with their mobile number linked to their Indian Overseas Bank account. An OTP is sent for initial setup, ensuring secure device binding. Users must have their registered SIM card in the device to perform transactions, enhancing security during payment processing.

The application offers a variety of features aimed at improving user experience. Notable functionalities include in-app payment voice notifications, biometric login for added security, and the ability to create a merchant profile. Additionally, users can generate QR codes for quick payments, access their recent transaction history, and benefit from multiple language options, making it accessible to a wider audience.