My dad has LiberPro on his iPhone, that's all I can say. He loves it... and paid $15 for it.
It appears to be just a scan of the Liber, but I would love an interactive one, where you wouldn't have to "turn" to the next page to continue the same chant, and that the scroll was continuous... (at least that's how his app seems to me). If others have more opinions, that would great to hear.
In my day, I had to download the Liber PDF to my Android phone and page through it with Amazon Kindle! No, wait, that's how I do it now. But I'd rather use the Graduale '61 'cause the scores are clearer. But really, a Liber Brevior is better than a phone for this purpose.
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