A reader has written in let us know about a new Gregorian chant app for mobile devices called Square Note, published by the Oblates of St Joseph, and available via iTunes and Googleplay. According to their website, it includes a repertoire of over 600 chants, cataloged for both the OF and EF, including Gregorian Mass propers, the Ordinary, and a variety of supplementary chants. I must admit (and Ben will bear witness to this) that I am pretty useless with technology, and I don’t actually own a device on which I could test this out; perhaps our readers can suggest in the combox whether they have used it and what they think of it.