xnotes is described as 'Handwriting-first notebook for phones and tablets, built for pen and stylus. Write, sketch and annotate with pressure-sensitive, variable-width ink, and nothing you draw is ever flattened' and is an app in the photos & graphics category. There are more than 50 alternatives to xnotes for a variety of platforms, including Windows, Mac, Linux, Android and iPad apps. The best xnotes alternative is Notesnook, which is both free and Open Source. Other great apps like xnotes are Microsoft OneNote, Xournal++, Excalidraw and Evince.