The first few levels in the piano syllabus of Yousician uses a special kind of notation we developed to aid music learning. We introduce the fundamentals of standard notation in a way that teaches the basics and allows a smooth transition to the full standard notation in later levels. In the first levels, the notation shows the pitch just like in the standard notation, but the rhythmic values are shown using the length of the note bubble. After Level 1, the note names are also written inside the note bubbles.
Please read this article to learn more about the different available views and how to change between them.