Abstract: A computing device with dynamic time flux regulator and lock-in user interface elements may include a time clock interface element where index data associated with an item is selectable within a first duration of time displayed on the time clock interface element. The lock-in user interface element, when executed, selects as reserved the index data associated with the item. In response to receiving a first activation input within the first duration, the user interface displays a modified lock element of the user interface transformed from an unlocked state to a locked state that indicates the index data associated with the product is reserved. Additionally, and in response to receiving the first activation input within the first duration, one or both of the user interface and an associated client device, may output a sensory response indicative of the locked state.