Open Source · Local-First

Your notes, your data,
your freedom.

Powerful and free note-taking app. Open format, data on your computer, no lock-in, no telemetry, no account required.

Download for Desktop View on GitHub

Features

Everything you need to organize your ideas

Powerful, fast and private. Built for those who take notes seriously.

100% Local

Your data stays on your computer. Works offline, no server, no external dependency.

Open Format

Human-readable JSON files. No proprietary format, no lock-in. Your data is truly yours.

Total Privacy

Zero telemetry, zero tracking, zero data collection. No account required.

Rich Text + Ink

Full editor with formatting, tables, code, checklists and freehand annotations.

Optional Sync

Sync with Google Drive, OneDrive or Dropbox whenever you want. Fully opt-in.

Cross-Platform

macOS, Windows and Linux. Native and fast with Tauri. Mobile on the roadmap.

Open format.
Human-readable data.

Every page is a .opn.json file on your filesystem. Organized in folders, versionable with Git, editable with any text editor.

✓ Versioned JSON schema
✓ Hierarchy: Workspace → Notebook → Section → Page
✓ Native Markdown export
✓ Simple backup: just copy the folder
✓ No proprietary database

{
  "schema_version": "1",
  "title": "Lesson 01 — Introduction",
  "blocks": [
    {
      "id": "b1a2c3d4",
      "block_type": "text",
      "content": {
        "tiptap_json": { ... }
      }
    }
  ],
  "tags": ["study", "lesson"]
}

Your notes, your data, your freedom.