Quicknotes is described as 'are used to create and manage in a easy and simple fashion your notes. It's not overhelming as the major note apps today. Simple notes, with simple formatting. But they have one nice feature for the only important thing in notes - keeping them organized' and is an website in the Office & Productivity category. There are more than 50 alternatives to Quicknotes, not only websites but also apps for a variety of platforms, including Windows, Android, iPhone and Mac. The best alternative is Joplin, which is both free and Open Source. Other great sites and apps similar to Quicknotes are Standard Notes (Freemium, Open Source), Google Keep (Free), Microsoft OneNote (Freemium) and Evernote (Freemium).
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.