HelixNotes

HelixNotes is a private, open-source Markdown notes app. Your notes remain standard Markdown files under your control. No account is required, and HelixNotes has no company-operated cloud.

Write with a clean visual editor or switch to source mode when you want direct access to the Markdown. Organize your work with notebooks, tags, wiki links and full-text search.

Features include:
• Tasks collected from checklists across your notes
• List and calendar views with priorities and due dates
• Wiki links and an interactive graph view
• Daily notes with a built-in calendar
• Markdown tables, code blocks and syntax highlighting
• KaTeX mathematical notation and Mermaid diagrams
• Outline navigation and tag autocomplete
• Version history and automatic backups
• Light, dark and customizable themes
• Optional WebDAV sync with your own server
• Optional AI tools using your own provider

Nothing leaves your device unless you enable a feature that connects to an external service. Your notes stay readable outside HelixNotes, without a proprietary format or platform lock-in.

HelixNotes is free software released under the GNU AGPLv3. Its source code is publicly available on GitLab.