This presentation reports on a semester-long study at a Japanese university examining the effectiveness of the pronunciation practice website English Accent Coach in improving English pronunciation among first-year students. Although pronunciation instruction is essential for spoken intelligibility (Levis, 2021), it is often underemphasized due to teachers’ limited confidence or perceptions that it is less important than other language skills (Mahmood et al., 2024). This study investigated whether regular, structured online pronunciation practice could lead to measurable improvement over one semester. Participants were divided into treatment and control groups. The treatment group used English Accent Coach as part of their weekly homework, engaging in guided pronunciation activities with automated feedback. The control group followed the same curriculum but did not use the platform regularly. Both groups completed identical pre- and post-tests measuring pronunciation accuracy and intelligibility. Preliminary results indicate greater improvement in the treatment group than in the control group. These findings suggest that online pronunciation tools may help address gaps in contexts where pronunciation instruction is limited, contributing to ongoing discussions in CALL research on effective technology use for developing spoken language skills.