justAnote is described as 'With justAnote you can add a written call note or voice memo at the end of your phone calls with important details that you will never forget. The call notes can then be sent directly to the person of your choice: a family member, friend or even your personal assistant' and is a Note-taking App in the Office & Productivity category. There are more than 25 alternatives to justAnote for a variety of platforms, including Windows, Android, iPhone, Online / Web-based and Mac. The best alternative is Joplin. It's not free, so if you're looking for a free alternative, you could try Standard Notes or Evernote. Other great apps like justAnote are CherryTree (Free, Open Source), CintaNotes (Freemium), Cryptee (Freemium, Open Source) and Notezilla (Paid).
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.
Notezilla is the leading sticky notes app for Windows, Android, iPhone/iPad and the web. Set reminders to sticky notes, Pin sticky notes, attach them to websites, docs & folders, sync between PCs and other devices, organize using folders and tags.