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Joplin

What it is

Joplin is a free, open-source note-taking and to-do application, which can handle a large number of notes organized into notebooks. In June 2026, it remains a cornerstone for privacy-conscious users who want to maintain control over their data while leveraging modern note-taking features.

What problem it solves

It provides a secure, private way to sync notes across multiple devices (desktop and mobile) using various cloud or self-hosted services (Nextcloud, Dropbox, WebDAV, etc.). It supports end-to-end encryption (E2EE), solving the privacy concerns associated with proprietary, cloud-only platforms. It also provides a robust API for integration with AI agents like Claude 4.8 Opus and GPT-5.5 via the MCP 3.0 protocol.

Where it fits in the stack

AI & Knowledge / Note Taking. It serves as a privacy-focused knowledge management and note-taking tool that integrates into the homelab automation stack via its REST API and web clipper.

Typical use cases

  • Personal Knowledge Management: Organizing personal and professional notes in a structured notebook format.
  • Web Research: Capturing web pages and screenshots using the web clipper extension.
  • Cross-Device Syncing: Syncing notes across devices with E2EE for maximum privacy.
  • AI Integration: Using Joplin as a long-term memory or scratchpad for AI agents via the Data API.

Strengths

  • Privacy: Strong E2EE and support for various sync targets (including self-hosted).
  • Format: Notes are stored in Markdown format, ensuring long-term accessibility.
  • Extensibility: Support for plugins, themes, and a powerful Data API.
  • Web Clipper: Powerful extension for capturing online content directly into notes.

Limitations

  • Sync Conflict Resolution: Can sometimes be less intuitive than cloud-native alternatives like Notion.
  • UI: While functional and improved in 2026, the UI may feel less "fluid" to some users compared to proprietary tools.
  • Real-time Collaboration: Lacks the seamless real-time multi-user editing found in web-first platforms.

When to use it

  • When you need a cross-platform, open-source note-taking app with strong privacy features.
  • When you want to host your own note synchronization (e.g., using Nextcloud or WebDAV).
  • When you need a note-taking tool that is highly scriptable via an API.

When not to use it

  • When real-time, multi-user collaboration is the primary requirement.
  • When you prefer the "canvas" or "block" based approach of tools like Obsidian or Notion.

Getting started

Installation

To start using Joplin, download the application for your platform: 1. Desktop: Download from the Official Website. 2. Mobile: Available on the App Store and Google Play. 3. CLI: Install the terminal application via NPM: 

npm install -g joplin

Enabling the API

  1. Open Joplin Desktop.
  2. Go to Settings > Web Clipper.
  3. Enable the Web Clipper service.
  4. Copy the Authorization token for use in scripts.

CLI examples

Joplin Terminal Application

Joplin offers a full-featured terminal application for console-based workflows.

# Start the terminal application
joplin

# Use internal commands (inside the joplin console)
:help
:ls
:edit "Project Notes"
:sync

REST API via curl

List all notebooks: 

curl -X GET "http://localhost:41184/folders?token=YOUR_TOKEN"

API examples

Python Integration

AI agents can interact with Joplin using the REST API to store or retrieve knowledge.

import requests

JOPLIN_TOKEN = "your_auth_token"
BASE_URL = "http://localhost:41184"

def create_note(title, body, folder_id=None):
    params = {"token": JOPLIN_TOKEN}
    data = {
        "title": title,
        "body": body
    }
    if folder_id:
        data["parent_id"] = folder_id

    response = requests.post(f"{BASE_URL}/notes", params=params, json=data)
    return response.json()

# Example: Create a research note
note = create_note("Claude 4.8 Research Findings", "Analysis of latest model performance...")
print(f"Created note ID: {note['id']}")

Web Clipper Service

The Web Clipper is a browser extension that allows you to save web pages directly. It communicates with the same local API used by scripts.

Sources / references

Contribution Metadata

  • Last reviewed: 2026-06-28
  • Confidence: high