ClusterFix — Two-Week Consonant-Cluster Bootcamp for English Apps

A plug-in module for English-learning apps that scores learners on the two most stubborn pronunciation errors — inserting an extra schwa after consonants and dropping final consonants — then fixes them with short, spaced, explicit drill sessions over two weeks, showing the user their error rate falling. It is aimed at the immigrant and international-professional learners that pronunciation apps already serve.