Noteshelf, unlike Goodnotes and Notability, also supports Android devices. For example, if you use an iPad with an Apple Pencil for planning, tasks can always be quickly viewed and slightly corrected using your android smartphone. The application has collected many useful functions from analogs, such as working with two notes on one screen, adding photos and audio to your planner, searching by handwriting input, etc.
Serious disadvantages are the lack of sync with calendars, inconvenient sync between devices via cloud storage, and the inability to create subfolders. But in general, the program is good and very interesting, taking a worthy place with the competitor-apps.