Despite the acknowledged complexity of early childhood educators' work, little is documented about how early childhood educators actually spend their time at work. A typical way of studying time at work is through the use of time-use diaries. Recent developments have shown the benefits of using randomized sampling electronic time-use diaries. This paper reports on the development and useability testing of a random time sampling (RTS) time-use smart-phone application to capture the work of educators, the first time such a method has been used in early childhood settings. Descriptive analyses were conducted of time use data collected from 20 Australian early childhood educators. Seventeen went on to participate in follow-up focus groups / interviews, which were thematically analysed. The paper demonstrates the capacity of RTS apps to gather accurate and useful data about educators' work, and points to the acceptability of this method to educators, and its manageability within early childhood settings. Limitations of the method, including, participant buy-in, design and technical requirements, and cost, are also highlighted.