PKM Wiki

Obsidian

3 min read

Obsidian is a powerful note-taking application and Tool for Thought. It stores everything locally using plain Markdown files, ensuring your data remains yours forever. Free for personal and professional use, it has become the most popular PKM tool as of 2025, with a massive ecosystem of community plugins and an active community.

History

  • Founded by Shida Li and Erica Xu (University of Waterloo)
  • Built during COVID-19 quarantine
  • First release: March 2020
  • v1.0.0: October 2022
  • CEO since February 2023: Steph Ango

Core Philosophy

Obsidian is built on three principles:

Local-first. Your notes are plain Markdown files on your filesystem. No proprietary database, no cloud dependency. You can read and edit them with any text editor. If Obsidian disappears tomorrow, your notes survive intact.

Extensible. The plugin system allows the community to extend Obsidian in virtually any direction. With 2000+ community plugins, you can add everything from kanban boards to spaced repetition to AI integration. This extensibility means Obsidian adapts to your workflow instead of forcing you into a predefined one.

Link-centric. Bidirectional links ([[wikilinks]]) are first-class citizens. The graph view visualizes your knowledge network. Backlinks panel shows every note that references the current one. Links, not folders, are the primary organizational primitive.

Key Features

  • Wikilinks and backlinks — [[Note Name]] creates a link; the linked note automatically shows a backlink
  • Graph view — Visual network of all notes and their connections
  • Canvas — Spatial canvas for visual thinking, arranging notes, images, and links on an infinite board
  • Bases — Database-like views for querying and filtering notes by metadata
  • Command palette — Quick access to any action via keyboard
  • Templates — Standardize note creation with predefined structures
  • Properties (YAML frontmatter) — Structured metadata for each note
  • Publish — Publish selected notes as a website
  • Sync — End-to-end encrypted sync across devices (paid service)
  • CLI — Command-line interface for vault operations
  • Quick Switcher — Fuzzy-search to open any note instantly
  • File Recovery — Built-in version history snapshots

The Plugin Ecosystem

Obsidian's community plugin ecosystem is its strongest differentiator. Notable categories:

  • PKM workflow: Dataview (query notes as a database), Templater (advanced templates), Metadata Menu (structured properties)
  • Reading integration: Readwise Official (sync highlights), Web Clipper (save web content)
  • Visualization: Excalidraw (whiteboarding), Mind Map, Canvas extensions
  • Task management: Tasks, Kanban, Day Planner
  • AI integration: Smart Second Brain, Copilot, various LLM integrations
  • Writing: Linter (auto-formatting), Longform (book/article writing)
  • Review: Spaced Repetition, Review plugins

Obsidian for PKM

Obsidian is particularly well-suited for PKM because it naturally supports:

The local Markdown storage also means notes are future-proof: readable by any text editor, versionable with git, and portable to any other Markdown-based tool.

Limitations

  • No real-time collaboration — Obsidian is designed for individual use. Shared vaults require external sync tools.
  • Learning curve — The flexibility and plugin ecosystem can overwhelm newcomers.
  • Mobile experience — Functional but less polished than the desktop app.
  • Sync costs — The official Sync service is a paid add-on ($4/month). Free alternatives (Syncthing, iCloud, Git) exist but require setup.

Key Points

  • Local-first Markdown storage; your data is always yours
  • Extensible via 2000+ community plugins
  • Link-centric with bidirectional wikilinks and graph view
  • Most popular PKM tool as of 2025
  • Supports all major PKM methods natively

Open Questions

  • How will Obsidian's AI integrations evolve relative to AI-native competitors?
  • Will Obsidian add real-time collaboration, or will it remain individual-first?

References

  • Vault: Obsidian, Obsidian Community Plugins, Useful resources for Obsidian, My PKM System Handbook
  • obsidian.md (official site)