This study investigated the impact of using phonetic tongue twisters combined with the ELSA Speak app on improving English pronunciation among Grade 9 learners in Integrated Schools in the Philippines. Employing a mixed-methods approach, the research measured the significant difference between pre-test and post-test pronunciation scores and explored students’ experiences through interviews. Descriptive statistics showed that students’ mean pronunciation scores increased from pre-test (M = 5.10, SD = 8.63) to post-test (M = 10.87), indicating a notable improvement after the intervention. Inferential analysis using a paired samples t-test revealed a statistically significant difference between the pre-test and post-test scores, t(30) = 16.00, p < .001. The calculated Cohen’s d = 2.00 indicated a very large effect size, suggesting that the intervention had a substantial impact on students’ pronunciation proficiency. Thematic analysis of interview responses revealed positive student attitudes, increased motivation, and enhanced confidence in speaking English. These findings suggest that integrating technology-assisted pronunciation practice with traditional phonetic exercises effectively supports English language learning in secondary education.