Liber Pro takes the 1961 Liber Usualis, a book of over 2,300 pages of Gregorian Chant for use throughout the liturgical year, and literally puts it at your fingertips on your iPhone or iPod Touch. Liber Pro adds to this tome a linked table of contents, user-defined bookmarks, vertical and horizontal paging and zooming, browser-like navigation, a dynamic liturgical calendar, and more.

Liber Pro is more than just an eBook. It is also a complete 1961 Roman Calendar, capable of calculating the moveable feasts throughout the year automatically. This means you can select a date; view the proper, common, and feria for that date; and jump instantly to the relevant pages in the Liber Usualis.

- 1961 Liber Usualis: over 2,300 pages
- Scroll, zoom, and page with touch gestures
- Simple “Back” and “Forward” buttons traverse browsing history
- Browse in portrait or landscape orientation
- Auto-centering keeps content in view when paging
- Option to hide view selector for additional viewing area
- Selectable paging direction: up and down or left and right
- Selectable overlay eases page viewing

- Calculates the day’s feast from the calendar of 1961
- Links to the starting page of the proper, common, and feria of the day
- Select today, the next or previous day, the next or previous week, or choose a day with a date picker

- User-defined bookmarks retain page, position, and zoom
- List of bookmarks can be reordered and individual bookmarks deleted

Table of Contents:
- Extensive table of contents provides links to Masses, offices, rubrics, and much more

- Provides links to the 100 most recently visited pages this session

What’s New

Version 2.1

- Update for iOS 11
- Calendar fix for the Vigil of Christmas falling on Sunday
- Fixed zooming issues from previous version
- Support for split screen on compatible devices
- User-selectable control over the following paging behaviors:
- Center page after swipe (on by default but can now be turned off via Settings app)
- Bounce off edges when scrolling (on by default but can now be turned off via Settings app)
- Page margin

Ratings and Reviews

4.8 out of 5
4 Ratings

4 Ratings

guardajoias ,

An excellent update to a brilliant application

This update brings Liber Pro to full compatibility with iOS 8 and 9, and the larger iPhone screens. Thank you. There are also several welcome adjustments. On an iPhone 6 with iOS 8, the screen is now well used and makes it much more efficient for liturgical use. The zoom is indeed a bit quirky, but this is much less required than before on newer screens, as in landscape mode, the page is perfectly readable and accessible. Hopefully that can be fixed in a subsequent update. The combination of a reliable calendar with all the pages of the Liber Usualis is just brilliant.

IrethCalmcacil ,

Fantastic on the iPad Mini

I recently got an iPad Mini 4, and almost the first thing I did after opening it up was purchase Liber Pro. I sing in a Gregorian Chant schola at my parish, and this app is fantastic. The calendar brings me right to the propers I need to sing for any given day, and I love that I can add bookmarks to quickly take me to different mass settings/propers/etc. No more lugging around a book, and no more noisy flip-flap-flip-flap of pages frantically turning back and forth to find the pages I need to sing. Thank you, Drake Applications!

JoHaPine ,

No more back pain!

I downloaded the new Liber Pro application and it is simply awesome. The mere fact that I can carry my iPod touch to the choir loft and not have to hold the real 5 lbs, back breaking Liber in my hands is worth the price. No more having to page through the 2,000 page book to find an out of sequence Gradual or Offertory. Simply jump to that page. I like the overlay feature, and the Table of Contents layout.

I have only one complaint, but it's more of a nit-pick than anything else. If you setup the Auto Hide feature to maximize the viewable area by hiding the view selector, the very top of the page (including the page number and title) are not viewable if you are in horizontal page navigation mode. You can get around that by selecting the vertical page navigation, and slowly scrolling up to the top of the page.

Who would have thought that you could attend the Extraordinary Form of the Mass, using the 1962 Missal, while following along and singing from an electronic device?

Deo Gratias!


Drake Applications
125.1 MB

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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