Numerous language learning applications and websites have recently introduced automatic pronunciation training features which are popular, particularly among young learners. However, language teachers may struggle to understand the capabilities, efficacy, and reliability of these programs. This chapter provides a critical overview of English pronunciation training features in mainstream applications such as DuoLingo, Memrise, Babbel, Busuu, Rosetta Stone, ELSA Speak, and IELTS Speaking Practice. It also surveys the rare studies investigating the diagnostic accuracy of these tools and whether learners make meaningful improvements by using them. We conclude that communication and collaboration need to develop among engineers, language teachers, linguists, pronunciation experts, and entrepreneurs to promote useful pedagogical outcomes for learners and to align with contemporary objectives in the field of English as a foreign language.