Bach Chorales is an iPhone app offering a collection of four-part Chorales harmonized by the renowned composer Johann Sebastian Bach. Upon launching the app, users are greeted with the Chorale number corresponding to the current day of the year. The app provides access to a selection of 371 Chorales through a user-friendly "Select Wheel" feature on the second screen.

Additionally, the app includes a "Text Switch" option that displays the title verse alongside the Chorale, enhancing the musical experience. Users can also utilize the "Figured Bass Switch" to replace the alto and tenor voices with figured bass, simplifying the harmony. Moreover, the "Transpose Wheel" allows users to adjust the key of the Chorale, facilitating practice in all twelve keys.