This study aimed to determine the needs of prospective elementary school teacher students in using the STEM (Science, Technology, Engineering, and Mathematics) approach and to produce STEM-based digital assessment application products that follow the independent curriculum. The methods used were interviews, Focus Group Discussions with lecturers and students of Elementary School Teacher Education at Universitas Muria Kudus, and literature studies. FGD was chosen as a substitute for direct trials in the field and became the basis for validating the feasibility of product development. The results show that students as prospective teachers do not yet have experience and knowledge of references with the STEM approach used in learning and the required assessment instruments according to the independent curriculum. The FGD process found that the STEM approach can be made in a web-based digital assessment application that is considered easy to use anywhere and anytime. The conclusion obtained is that the application of STEM-based digital assessment is an application that provides a source of reference on digital literacy and STEM, as well as creates assessment instruments that students can use as prospective teachers in implementing STEM-based digital assessments.