Vetus Ordo Missae App, developed by Del Carlo, is a free Android app that provides a comprehensive guide to the Tridentine Mass. With this app, you can follow the liturgy of the extraordinary form of the Roman Rite, both on weekdays and holidays. The app also offers translations from Latin into various languages.

In addition to the liturgy, Vetus Ordo Missae App offers a range of features to enhance your experience. You can generate PDF files of the displayed contents, read and listen to the Rosary in Latin, and access the main traditional Latin prayers. The app also allows you to listen to some traditional Gregorian chants and facilitates connections to useful sites to research the traditional Mass. You can even connect to some YouTube channels for viewing traditional Mass streaming.