myNotes is described as 'well designed, very intuitive note manager. Its ease of use is praised by users worldwide, which is combined with powerful features. Create and manage notes, lists, and clippings, store your ideas and thoughts, or write a diary with myNotes' and is an app in the Office & Productivity category. There are more than 50 alternatives to myNotes for a variety of platforms, including Windows, Mac, Android, iPhone and Online / Web-based. The best alternative is Joplin. It's not free, so if you're looking for a free alternative, you could try Standard Notes or Microsoft OneNote. Other great apps like myNotes are Evernote (Freemium), Simplenote (Free, Open Source), CherryTree (Free, Open Source) and Zim (Free, Open Source).
Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor.