Most devotional apps are broadly Christian, which in practice means they are shaped like nothing in particular. The readings could be for anyone, the reflections avoid anything a Protestant and a Catholic might disagree about, and the calendar of the Church — the thing that has ordered Catholic prayer for centuries — is absent entirely.
Devout asks which tradition you stand in before it gives you anything, and Catholic is one of the answers.
What the morning looks like
One page. A passage of Scripture, a reflection on it, a voice from the Christian past, and a question waiting in a private journal. The same shape every day, so that a practice has somewhere to settle rather than a new decision to make each morning.
What is on that page, though, follows from your answer. The Scripture comes with the Mass readings behind it. The reflection is written to be read within the living Tradition rather than around it — sacramental language is used rather than avoided, the saints are present rather than edited out, and Marian passages are treated as a Catholic would expect them to be treated.
Written for the tradition, not translated into it
There is a difference between a devotional that avoids offending Catholics and one that is actually Catholic. The first reads as careful; the second reads as home.
When a passage is theologically contested — and a number of them are — Devout does not split the difference or go quiet. It gives you the reading your own tradition gives, and says so. The reflections on those passages were written one tradition at a time and reviewed before they were published, which is slower than generating them and the reason they can be trusted.
What it does not do
It is not a prayer app. There is no audio, no guided rosary, no one talking you through the morning — if that is what you want, there are apps that do it well and this is not one of them. Devout is read, in silence, with a pen.
It is also not a replacement for the Mass, the sacraments, or your parish. It is the ten minutes before the day starts, and it is careful not to pretend to be more than that.