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Obsidian AI screenshot

What is Obsidian AI?

Obsidian is a note-taking and knowledge management application that stores all your notes locally on your device rather than in the cloud. It uses a graph-based linking system to help you connect ideas across your notes, creating a personal knowledge base. The application includes AI features that assist with writing, summarisation, and note organisation. Obsidian is designed for people who want to build a long-term repository of their thoughts, research, and learning whilst maintaining full control over their data and keeping everything private on their own computer.

Key Features

Local storage

all notes are stored on your device; nothing is sent to external servers by default

Backlinks and graph view

visualise connections between notes to see how your ideas relate

AI-assisted writing

use built-in AI tools to help draft, refine, and summarise content

Markdown-based

write in plain-text markdown format for flexibility and future-proofing

Customisable with plugins

extend functionality with community-built plugins and themes

Offline-first

work without internet connection; sync is optional

Pros & Cons

Advantages

  • Complete data ownership and privacy; your notes never leave your device unless you choose to sync
  • Powerful linking system helps you discover connections and build a meaningful knowledge network
  • Active community providing free plugins and themes to extend core functionality
  • Works across multiple devices with optional paid sync service

Limitations

  • Steeper learning curve than simpler note-taking apps; graph-based thinking takes time to adopt
  • AI features may require setup and configuration; quality depends on your prompts and the underlying AI model
  • No built-in web clipper or automatic content capture like some competing tools

Use Cases

Building a personal wiki or knowledge base for long-term learning and research

Organising research notes with interconnected references for academic or professional projects

Creating a daily journal with linked thoughts that evolve over time

Maintaining a private, searchable archive of ideas, articles, and personal insights

Developing a second brain system to externalise and organise your thinking