Blue Canoe is offering free classroom subscriptions to their mobile, AI-enhanced ESL pronunciation app this semester through December, 2020. Teachers who are new to Blue Canoe are eligible to register their students and access a teacher's dashboard where you can monitor student engagement.
The app works on iOS and Android phones. The teacher's dashboard is web-based and allows teachers to monitor student use of the app (which you might assign as homework, for example).
Full disclosure: I'm the co-author of the Color Vowel Chart, which provides the methodological base for Blue Canoe. Through Color Vowel and Blue Canoe, my colleagues and I provide free support for teachers who use the app and/or the pronunciation teaching method.
(If you have already participated in this initiative, you can contact Blue Canoe for school-level pricing options, or you can direct your students to download the free Basic version of Blue Canoe.)
To participate in Blue Canoe's "Free for Classroom" initiative, you just fill out this form at Free for classrooms program | Blue Canoe Learning
I'm happy to answer questions.