Abstract: Account allocation and management systems and methods are described. A server generates an interactive web interface on a user device including an account creation tool having user input tools for creating a user-defined first account. The server continually monitors account condition data from among plural financial systems. The server determines a proposed combination including plural second accounts selected from among the financial systems, based on the monitored data and at least one user input indication, where the proposed combination includes optimized account characteristics. The proposed combination including a portion of the optimized characteristics are displayed on the interactive web interface. Responsive to a confirmation from the user device, the user-defined first account is created that includes the plural second accounts. The server, responsive to detecting a change in the monitored data, automatically rebalances one or more among the second accounts in accordance with the detected change.