Kardnote is described as 'aims to provide a daily note-taking tool with the power of Markdown. However, Markdown is optional here; it also has an intuitive rich-text editing mode. In this mode, you even don't need to know what Markdown is' and is an app in the Office & Productivity category. There are more than 50 alternatives to Kardnote for a variety of platforms, including Windows, Android, iPhone, Mac 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 Kardnote are Evernote (Freemium), CherryTree (Free, Open Source), NoteLedge (Paid) and Trilium Notes (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.
A productivity and task management tool appropriate for both individuals and businesses. With Nimbus Note users can create notes and to-do lists, share them with others, and archive important data. Save anything. Access it anywhere. Share with anyone.
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.