Review of BoldVoice

[First paragraph of review] Technology has increasingly expanded opportunities for second language (L2) learners to practice pronunciation beyond the classroom. This development is particularly relevant as contemporary pronunciation instruction emphasizes helping L2 learners develop speech that is comprehensible to listeners in communicative contexts. Saito’s (2021) meta-analyses showed that L2 speakers’ comprehensibility is associated with a range of segmental, prosodic, and temporal features and that pronunciation instruction produced greater gains in comprehensibility than in native-likeness. Research has also demonstrated that explicit instruction targeting suprasegmental features can improve learners’ comprehensibility and fluency (Gordon & Darcy, 2022). Together, these findings suggest that technology-supported pronunciation practice should provide opportunities to develop not only individual sounds but also broader features of speech that contribute to comprehensibility.