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, iPad, 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
- Option to hide view selector for additional viewing area
- Selectable paging direction: up and down or left and right
- Selectable overlay eases page viewing
- Two-finger tap brings up markup palette (In-App Purchase Required)

- 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

Search: (In-App Purchase Required)
- Text-based search of the Liber
- Tap a search result to jump to the page

Annotations: (In-App Purchase Required)
- iPhone/iPod
- Three drawing tools plus selection tool
- Freeform or four-point-fill drawing modes
- Four colors available plus ability to white page text out
- iPad
- Includes all annotation features available for iPhone/iPod
- Additional highlighter tool
- Four point line-to mode
- Twelve color palette

What’s New

Version 3.3

Stability improvements and updates for iOS 14.

Ratings and Reviews

3.8 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.

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!

C4_993_Driver ,

Very appreciative of the effort, but...

Such great potential, but this falls short in terms of practical use. Yes, it's not an eBook as another review mentioned, but the pages don't have an adjustment where a single page cab be viewed. I chant in a schola, and not being able to see a complete page is rather limiting. In addition, the page "turning" is very slow to resolve. The next page "snaps" in place and ruins the flow. Think of this as the chant moves from one page to the next. Virtually unusable.

In addition, although there are bookmarks, the app is very slow. One has to access the "bookmark menu", press the desired bookmark, and then let the app think about it. By the time the screen finally resolves, the flow of following is ruined -- especially for the short variable parts such as the Introit.

This has great potential, but the slowness of the app and the lack of customization doesn't leave me with a positive experience. This would be a tough app to recommend.

App Privacy

The developer, Drake Applications, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

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

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