This paper endeavored to examine the validation of the English-Speaking Practice Application in developing the speaking skills of English as a Foreign Language (EFL) learners. According to the author, the Desuggestopedia teaching method—which strives to establish a comfortable and relaxing learning environment that improves language acquisition—is the basis for this program. Forty-four diploma candidates from Saudi Arabia's Qassim University participated in the study. Over 12 weeks, they spent 30 minutes a week using the app. Using a survey questionnaire, they were asked to rate the app's usefulness, efficacy, and motivational effects. The internal consistency of the questionnaire was high (Cronbach's alpha = 0.89). According to the study's findings, EFL diploma students had a favorable opinion of the English-Speaking Practice App in terms of its usefulness, efficacy, and motivational influence. This study advances the field of language instruction and emphasizes the possibilities of technology-enhanced language learning. The findings of this study can help practitioners and educators create and apply useful tools and techniques to enhance the speaking abilities of EFL students.