This article reports on the initial conceptualization of a web-based platform aimed at supporting Japanese tertiary-level students in English vocabulary acquisition. It outlines some of the pedagogical and practical considerations that have influenced the development of this web-based software. By reviewing previous literature and highlighting some of the challenges that Japanese EFL learners may face in learning vocabulary, it sets a framework for the development of a program that can contribute to filling some of the gaps between existing software and the needs of Japanese EFL students in tertiary education, as well as being applicable to a wider population of EFL learners. The software is intended to support autonomous, data-driven learning by allowing learners to develop personalized word lists through the use of corpus tools and standardized word lists. As cloud computing has become cheaper and more easily accessible in recent years, users will be able to save word list data for future study. Furthermore, researchers and instructors will be able to collect data-usage information to better inform their practices.