my-oto-mo is a free Android app developed by Gakken Co.Ltd under the Education & Reference category's Books subcategory. It allows users to play audio from English reference books for elementary and junior high school students published by Gakken. The app has a simple and user-friendly interface, and it comes with a convenient feature that allows users to adjust the playback speed of the audio. Users can easily select and play the tracks they want to listen to without the need for a CD player.

According to user reviews, my-oto-mo is highly appreciated for its convenience and ease of use. Users can listen to the audio anytime and anywhere, making it a great companion for English language learners.

Please note that the supported books must be purchased from bookstores, and the list of supported books can be found on the my-oto-mo website.