Notenik is a free and open-source Mac app for taking and organizing notes using Markdown. It can be downloaded from the Mac App Store.
Notenik has a few distinguishing features in the increasingly crowded field of note-taking apps:
The Collection window shows two tabs on the left, and another two on the right. On the left, the user can switch between a sorted list of all notes in the collection, and an outline of all notes, organized by tags. On the right, the user can switch between an edit view and a display view.
All Notenik documentation is stored in the Notenik Knowledge Base, which is itself a Notenik Collection, and is always accessible from within Notenik (as well as from the web).

Notenik provides support for the following Markdown elements.
| Element | Support | Notes |
|---|---|---|
| Headings | Yes | |
| Paragraphs | Yes | |
| Line Breaks | Yes | |
| Bold | Yes | |
| Italic | Yes | |
| Blockquotes | Yes | |
| Ordered Lists | Yes | |
| Unordered Lists | Yes | |
| Code | Yes | |
| Horizontal Rules | Yes | |
| Links | Yes | |
| Images | Yes | |
| Tables | Yes | |
| Fenced Code Blocks | Yes | |
| Syntax Highlighting | No | |
| Footnotes | Yes | |
| Heading IDs | No | |
| Definition Lists | Yes | |
| Strikethrough | No | |
| Task Lists | Yes | |
| Emoji (copy and paste) | No | |
| Emoji (shortcodes) | No | |
| Highlight | No | |
| Subscript | No | |
| Superscript | No | |
| Automatic URL Linking | No | |
| Disabling Automatic URL Linking | No | |
| HTML | Yes |
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