Introibo is a prayer companion built for the traditional Catholic life. Designed for the Roman Missal and Roman Breviary, with full support for the 1962, 1955, and pre-1955 rubrics. Ad-free, offline, and without subscription. No accounts. No tracking. Just the prayers of the Church, always available. YOUR DAILY COMPANION The Hodie screen shows today's feast, the proper of the Mass, the Divine Office, fasting and abstinence obligations, the daily psalm, and the seasonal Marian antiphon, all computed from the traditional calendar. See the liturgical colour, the season, and countdown to the next major feast at a glance. Follow one of seven patron saints with daily practice checklists and streak tracking to build a habit of devotion. THE TRADITIONAL ROMAN MISSAL The entire Ordinary woven together with 574 daily Propers in their correct order, each with full English translations. Latin and English rendered side-by-side. Every rubric observed: 14 proper Prefaces selected for each season and feast. The Gloria appears only when the rubrics prescribe. The Credo on Sundays and major feasts. Psalm 42 omitted in Passiontide. Proper Tracts replace the Alleluia from Septuagesima through Palm Sunday. The Canon includes proper Communicantes and Hanc Igitur for the great feasts. The correct dismissal, Ite Missa Est, Benedicamus Domino, or Requiescant in pace, chosen automatically. Three distinct Masses for Christmas. The Requiem Mass with its proper texts. THE DIVINE OFFICE Pray all eight canonical hours: Matins, Lauds, Prime, Terce, Sext, None, Vespers, and Compline. The complete weekly psalter with individual antiphons. Proper capitula, hymns, and versicles change automatically with the season. 285 saints' feast propers with collects and antiphons. Three-nocturn Matins with Te Deum for Class I and II feasts. Seasonal hymns for Advent, Lent, Passiontide, Easter, and Christmas. Four Marian antiphons at Compline. Set reminders for each canonical hour. LITURGICAL CALENDAR Browse the traditional calendar month by month in list or grid view. Every day shows its Latin feast name with English translation, liturgical colour, and season. Tap a day for full detail: feast, colour, season, fasting obligations under your chosen discipline, and a link to that day's Mass. Share any day as a styled PDF. THREE SETS OF RUBRICS Choose your tradition. The 1962 rubrics, the 1955 reforms, or the pre-1955 Tridentine rubrics, each with its own calendar and feast rankings. The ordo resolves temporal and sanctoral conflicts, tracks commemorations, and assigns the correct liturgical colour for every day. FASTING AND ABSTINENCE Three penance disciplines: the 1962 norms, the 1917 Code of Canon Law (with Ember Day fasts, vigil fasts, and Saturday Lenten abstinence), and the stricter pre-Pius XII observance (with Advent fasting and no upper age limit). The app shows your next obligation day and spells out exactly what you can and cannot do. SEARCH Search across everything, prayers, Mass propers, Office hours, saints, and reference articles, from one search box. Diacritic-insensitive, so "miserere" finds "Miserére." Results link directly to the content. PDF EXPORT Share or print the Mass propers and calendar days as styled PDFs with parchment background and bilingual side-by-side layout, ready to take to Mass. 67 TRADITIONAL PRAYERS Build a personal prayer rule for morning, midday, and evening. Browse 12 occasion categories. Every prayer in Latin and English. The complete Rosary bead by bead. Fourteen Stations of the Cross. Examination of conscience and confession preparation. LEARN LATIN Ten lessons in Ecclesiastical pronunciation. 97 flashcards. Psalms and Vulgate reading exercises. REFERENCE LIBRARY 41 articles. 574 searchable Propers with full English translations. Mass history timeline. Liturgical glossary. Everything works offline. No internet permission. No analytics. No data collection. Your prayer life stays on your device.