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SHARPEN YOUR THINKING.

Obsidian is the private and flexible writing app that adapts to the
way you think.

Get Obsidian for Windows More platforms

Your thoughts are yours. Obsidian stores notes on your device, so you can access
them quickly, even offline. No one else can read them, not even us.
Your mind is unique. With hundreds of plugins and themes, you can shape Obsidian
to fit your way of thinking.
Your knowledge should last. Obsidian uses open, non-proprietary files, so you're
never locked in, and can preserve your data for the long term.
Free for personal use
Download now


SPARK BRILLIANCE.

From personal notes to journaling, knowledge bases, and project management,
Obsidian gives you the tools to come up with ideas and organize them.

Links Create connections between your notes. Link anything and everything —
ideas, people, places, books, and beyond. Invent your own personal Wikipedia.

In Meditations on First Philosophy the philosopher René Descartes describes a
series of doubts about the nature of reality, arriving at the famous phrase:

 * [[I thin]]

 * I think therefore I am
 * Just think about it
 * Thinking, Fast and Slow
   
   Books/
 * The Thing
   
   Movies/

He argues that doubting requires thinking, and therefore, the act of thinking
confirms his existence.

Graph Visualize the relationships between your notes. Find hidden patterns in
your thinking through a visually engaging and interactive graph.

Canvas An infinite space to research, brainstorm, diagram, and lay out your
ideas. Canvas is a limitless playground for your mind. Learn more.
Lecture 1


Rationalists

 * Reason and innate knowledge → acquire knowledge
 * Fundamental truths and principles can be known independent of experience
 * A priori reasoning
 * Reason and deduction

Empiricists

 * Experience and sensory perception → acquire knowledge
 * All knowledge is derived from experience and observation of the external
   world
 * A posteriori reasoning

Cogito, ergo sum

In Meditations on First Philosophy the philosopher René Descartes describes a
series of doubts about the nature of reality, arriving at the famous phrase:

I think therefore I am

He argues that doubting requires thinking, and therefore, the act of thinking
confirms his existence.

Philosophers




Plugins Build your ideal thinking space. With hundreds of plugins and our open
API, it's easy to tailor Obsidian to fit your personal workflow. Learn more.
Community plugins
Calendar by Liam Cain
Calendar view of your daily notes.

Kanban by Matthew Meyers
Markdown-backed kanban boards.

Dataview by Michael Brenan
Advanced queries for the data-obsessed.

Outliner by Viacheslav Slinko
Work with your lists.

Tasks by Martin Schenck and Clare Macrae
Track tasks across your entire vault.



SYNC SECURELY.

Access your notes on any device, secured with military-grade AES‑256 encryption.
Learn more.

Fine-grained control. Decide which files and preferences you want to sync to
which devices.
Version history. Easily track changes between revisions, with one year of
version history for every note.
Collaboration. Work with your team on shared files without compromising your
private data.



PUBLISH INSTANTLY.

Turn your notes into an online wiki, knowledge base, documentation, or
digital garden. Learn more.


Seamless editing Publish your notes instantly from the Obsidian app, and make it
easy for readers to explore your web of ideas.

Customization Control the look and feel of your site with themes, custom
domains, password protection, and more.

Optimized for performance Obsidian Publish sites are fast, mobile-friendly, and
optimized for SEO, no configuration required.

Explore the Obsidian Help site, powered by Obsidian Publish.


IT'S YOUR TIME TO SHINE.

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Get help, ask questions, meet other Obsidian users, and learn about their setup.
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Post feature requests, report bugs, and explore in-depth discussions about
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Developer docs
Learn how to build your own Obsidian plugins and themes, using our open API and
documentation.
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