Logseq is an open-source note taking application that supports Markdown and Orgmode syntax. As it prioritizes privacy, everything is stored locally on your machine for the desktop and web applications. There’s not currently a mobile app, but there is an option to use git for note storage and link the repository with Logseq.
Logseq provides a very promising feature set: back links, note graphs (inspired by Roam Research), automated card creation (for learning), templates, and much more.

Logseq provides support for the following Markdown elements.
| Element | Support | Notes |
|---|---|---|
| Headings | Yes | |
| Paragraphs | Yes | Every paragraph starts with a hyphen character (-)
|
| Line Breaks | Yes | Use CR character (\r)
|
| 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 | Yes | |
| Footnotes | No | Not yet supported, but it’s on the roadmap |
| Heading IDs | No | |
| Definition Lists | No | |
| Strikethrough | Yes | |
| Task Lists | No | Logseq has predefined commands for this: TODO/DOING/DONE or LATER/NOW |
| Emoji (copy and paste) | Yes | |
| Emoji (shortcodes) | No | |
| Highlight | Yes | |
| Subscript | No | |
| Superscript | No | |
| Automatic URL Linking | Yes | |
| Disabling Automatic URL Linking | No | |
| HTML | Yes | Requires XHTML tags: tags must be closed or self-closing (e.g. <p/>)
|
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